Do US airlines let you check a stroller and car seat for free?

On most major US carriers, yes. When you travel with a child, one stroller and one car seat (child restraint) are commonly accepted free and do not count toward the usual checked-bag allowance (American, Delta, United, Southwest, Alaska and Hawaiian, JetBlue, Frontier, Sun Country’s Contract of Carriage, Avelo’s Young Travelers FAQ, and Breeze’s Contract of Carriage). Confirm the gate and ticket counter rules on your airline’s page. Check Allegiant’s own page, as its rules are not confirmed here.

Does a diaper bag count as a personal item?

It depends on the airline. American publishes one diaper bag per child that does not count as your carry-on or personal item. Frontier allows adults with lap infants a second personal item such as a diaper bag at no charge. Delta lists a diaper bag as a personal-item example (so it fills that slot). Alaska and Hawaiian say a lap infant’s diaper bag counts toward the adult’s carry-on limit. Breeze allows one infant bag per infant outside the normal carry-on count. Always match the carrier you booked.

Can I bring a car seat onboard for a lap infant?

Generally only if the child has a purchased seat (or your airline explicitly allows use of an empty adjacent seat). Airlines and the FAA require an approved child restraint with the proper labels; lap-held infants are not secured in a car seat on the adult’s lap. Boosters and chest-harness “papoose” devices are widely restricted for taxi, takeoff, and landing.

What’s the difference between checking a stroller at the gate and at the ticket counter?

Gate-check means you use the stroller to the departure door, tag it there, and usually reclaim it at the arrival claim area or jet bridge (airline-specific). Checking it at the counter or curb sends it with your checked bags earlier. Some airlines (American, for example) limit how many of the free stroller and car seat you may gate-check; others allow both to the gate. Southwest asks you to tell the agent if you want jet-bridge return.

Do lap infants get a free checked suitcase?

Often no on domestic US itineraries. Examples: United (domestic lap infant: no bags in the infant’s name), JetBlue (lap infants get no checked allowance), Delta (unticketed children have no separate allowance). American publishes a free infant checked bag on international lap-infant tickets with stated size and weight limits. Never assume a suitcase allowance without reading that airline’s infant baggage section.

Are breast pumps and milk free extras?

Several airlines say breast pumps or milk coolers don’t count toward the normal carry-on and personal item (for example, American; Delta for a breast pump and cooler; United allows a pump, milk and formula with a carry-on even without the child; Avelo lists no fee for a breast pump). TSA screening rules still apply. Use the airline page and TSA guidance for traveling with children; this is not medical advice.

US Airline Rules for Strollers, Car Seats, Lap Infants and Diaper Bags (2026)

Compare 12 US airlines on free strollers, car seats, lap-infant bags, and diaper-bag rules, including gate-check or cabin, with official sources for every rule.

Quick answer

Most US airlines let you check one stroller and one car seat free when traveling with a child (often at the gate). Those usually don’t count as regular bags. Diaper bags are where the rules differ most: some airlines treat them as a free extra, others as your personal item, and a few count a lap infant’s bags against the adult. Confirm your airline’s children page before you pack.

Last verified: Sep 16, 2026

How we check: We only publish what these official pages say. See How we verify fees.

Check the airline’s children or special items page before you fly. Our Allegiant entries are kept general, so check Allegiant’s own pages.

12-airline comparison table

Table entries are summaries only. Using a car seat in the cabin always needs a purchased seat for the child (or an empty adjacent seat where the airline allows) and an FAA-approved label when the airline requires it. We only list dollar amounts an airline publishes.

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Airline	Stroller	Car seat	Lap infant (bags)	Diaper bag	Breast milk and pump (if published)	Official sources
American	1 stroller and 1 car seat free per ticketed customer traveling with a child (or adopting). Both at the ticket counter, or 1 at the gate and 1 at the counter. Non-collapsible strollers and stroller wagons without safety straps go to the counter. Other strollers go to the gate. A fully collapsible stroller under 20 lb that fits overhead may go in the cabin (per the Contract of Carriage and carry-on page).	Free check as above. Cabin use: FAA-approved safety seat; child needs purchased seat (or available adjoining seat).	Domestic lap infant: add to the reservation. International lap infant: the airline issues an infant ticket, with 1 free checked bag for the infant (up to 25 lb and 22×14×9 in) through an airport agent, as published.	1 diaper bag per child; it does not count as a carry-on or personal item.	A breast pump and a small soft-sided cooler of breast milk don’t count (even without a child).	Traveling with children; Carry-on
Delta	Strollers are free and don’t count toward the baggage allowance. Check at the curb, counter or gate.	Child-restraint seats free; don’t count. Cabin: FAA-approved if purchased seat or open seat in row; else gate-check.	Unticketed or free child: no separate bag allowance, so the child’s bags count in the adult’s allowance. Ticketed child: allowance based on the fare (international 10% fare rules published).	Listed as a personal-item example on carry-on page (counts as personal item, not a third free bag).	A breast pump and its cooler bag may come as an extra free cabin item (size limits still apply). A booster or other infant seat is also listed as an extra free cabin item.	Children and infant items; Carry-on; Infant travel
United	1 stroller or folding wagon and 1 car seat free per child; gate or ticket counter. Large or non-collapsible strollers and non-folding wagons go to the counter (still free). Collapsible or compact strollers may go in the cabin if they meet carry-on size when folded (United’s FAQ gives the gb Pockit as an example). Pet strollers are checked in the lobby; count toward checked allowance.	Free to check, as above. In the cabin: FAA-approved seat (the page quotes certification sticker wording for seats made after 1985). Window seat preferred. Not allowed in Polaris on 767, 777 and 787 aircraft or in exit rows.	Domestic lap infant: cannot check bags in infant’s name. International lap infant (no ticket) or ticketed infant: may check bags in the infant’s name under standard bag rules.	When traveling with a child, the published free extras are an FAA-approved car seat and a compact folding stroller. A diaper bag isn’t listed as a third free item when traveling with a child (United’s FAQ mentions it for travelers without a child).	Breast pump, breast milk and formula allowed with a carry-on even without a child; ice for milk or formula on request.	Traveling with children; Courtesy bags
Southwest	When traveling with children, each ticketed customer may check 1 stroller and 1 car seat free. Curb, counter or gate. Gate-checked items normally claimed at baggage claim; ask agent for jet bridge return if preferred. Limited release of liability.	Same free check. If the child has a purchased ticket, an FAA-approved car seat used in flight does not count toward the carry-on limit.	Lap infant allowed under Contract of Carriage age rules on Southwest infant pages. Confirm infant fare and tax on the airline’s infant page; we don’t list infant ticket prices. Bag extras for a lap infant beyond the stroller and car seat: Southwest’s stroller article lists none, so check its infant travel pages.	Not published on the stroller and child items page we cite, so check the airline’s children page. Assume it counts toward your standard carry-on and personal item unless another Southwest page says otherwise.	Not published on the page we cite, so check the airline’s children or nursing page.	Stroller and child items
Alaska (same rules as Hawaiian)	Car seat and stroller transported free as checked baggage; check with other bags or at gate. Collapsible stroller wagons for children, up to 90 linear in and 35 lb, are also free under that rule; larger wagons or wagons not for children pay standard bag fees.	Free to check, as above. Car seat in the cabin: needs FAA approval labels; seat width table on the page (narrowest listed 16.3 in).	Lap infants fly free within the US (taxes and fees may apply on international trips). Diaper bag counts toward the ticketed adult’s standard carry-on limit; lap infants not entitled to their own carry-on allowance.	Counts toward adult carry-on (not a free third item) when with lap infant.	Not published on the page we cite, so check the airline’s children page.	Strollers and car seats; Lap infants
JetBlue	A child may bring 1 stroller (plus the bags included with the ticket and 1 car seat). Also allowed as a courtesy when you are meeting a child at your destination. Checked strollers are not covered for damage (Contract of Carriage, section 19, noted on the page).	1 car seat; checking it is free and doesn’t count toward the checked allowance. Rules for car seats in the cabin and Mint aircraft exceptions are published. Playpens, wagons and infant beds count as checked bags.	Lap infant: bring 1 diaper bag, 1 stroller and 1 car seat. Lap infants do not qualify for checked baggage allowance.	Lap infant page: 1 diaper bag listed with the stroller and car seat. The ticketed child “baggage allowance” section lists a stroller and car seat; the diaper bag rule is on the lap infant page.	Not published on the page we cite, so check the airline’s children page. General TSA liquid rules still apply.	Traveling with children; Lap infants
Frontier	Strollers are checked free; use yours through the airport, gate-check it and get it back at your destination; it doesn’t count toward your carry-on or personal item. You may bring it in the cabin if it fits overhead.	Car seats are checked free and don’t count. In the cabin: FAA-approved seat with a purchased child seat; label required or it must be checked. Boosters not allowed for taxi, takeoff or landing.	Infants under 2 may fly free on an adult’s lap (minimum age 7 days, per the FAQ).	Adults with lap infants may bring a second personal item, such as a diaper bag, at no charge.	Not published on the page we cite, so check the airline’s children page.	Stroller fee FAQ; Traveling with small child; Car seat onboard
Allegiant	Check Allegiant’s traveling with children and baggage pages; not listed as a free item here.	Check car seat use in the cabin and the free check on Allegiant’s current children and baggage pages.	Check lap infant bag rules on Allegiant’s current children page.	Check Allegiant’s current pages; we don’t list a rule here.	Check Allegiant’s current children page.	Traveling with children; Baggage
Hawaiian	Uses the same published pages as Alaska (shared Alaska and Hawaiian content). Free car seat and stroller check, at the gate or with bags; same wagon size and weight rule as Alaska.	Follows Alaska.	Alaska rule: lap-infant diaper bag counts toward adult carry-on.	Counts toward adult (lap infant).	Not published on the page we cite, so check the airline’s children page.	Hawaiian strollers and car seats; Hawaiian infants and children; same lap infant page as Alaska
Sun Country	Car seats and strollers may be checked at no additional charge (Contract of Carriage). A Durable Enclosure (at least 5 mm of padding or a hard case) is required under the liability protection terms. Folding wagons are named in the liability exclusion along with seats and strollers.	Car seat in the cabin: an approved hard-backed seat when a ticket is bought for the child, the seat is reserved and the seat belt secures the device. A lap child’s car seat must be checked.	A lap child (8 days to 24 months) may fly free under set conditions; the child’s carry-on counts toward the ticketed adult’s allowance.	“Infant bag” listed as an example of an under-seat personal item (size published in the Contract of Carriage); not listed as a free third piece beyond the personal item.	not listed as a free extra in the contract of carriage sections we checked.	Sun Country Contract of Carriage (Rules 50, 195, 205, 220): Contract of Carriage PDF. The bags web page is an interactive app, so we use the Contract of Carriage.
Avelo	No fee for a stroller (Young Travelers FAQ).	No fee for a car seat or booster seat. Car seat in the cabin: hard-backed, with aircraft approval labels, no wider than about 16.5 to 17 in (space between armrests). Boosters not allowed on board at any time.	Infant in lap option for children under 2 at booking; the airline recommends a purchased seat and a car seat. Proof of age: government ID, birth certificate or passport (electronic copies, photos and immunization records not accepted for a lap child).	Not published on the Young Travelers page we cite, so check the airline’s children page. Assume standard personal item rules unless another Avelo page says otherwise.	No fee for a breast pump.	Young Travelers
Breeze	1 baby stroller or collapsible wagon accepted free as checked baggage for each infant or child (must be properly packed; liability limits apply if not). A collapsible stroller or wagon can be gate-checked; it does not count toward the carry-on allowance when used for the infant or child.	1 child seat checked free for each infant or child. In the cabin if a seat is bought for the infant or child; FAA approval labels required.	Lap infant allowed (limited number per flight; at least 7 days old). International trips may add taxes and fees, which we don’t list.	1 infant bag per infant does not count toward the carry-on allowance (Contract of Carriage, section 7.B).	Food to eat on board is listed among items that don’t count; no free extra for a breast pump is published in the Contract of Carriage we cite, so check the airline’s children page.	Contract of Carriage PDF. Help: Stroller and Car Seat Policy (an interactive app, so facts here come from the Contract of Carriage).

Decision boxes

Free, or counts as a bag

Usually free and not counted as regular bags: one stroller and one car seat when traveling with a child (American, Delta, United, Southwest, Alaska and Hawaiian, JetBlue, Frontier, Sun Country’s Contract of Carriage, Avelo’s FAQ, Breeze’s Contract of Carriage). Check Allegiant’s own pages.
Diaper bag split:
- Free extra (doesn’t count): American (1 per child); Frontier (2nd personal item with a lap infant); JetBlue lap infant list; Breeze (1 infant bag per infant).
- Counts as a personal item or against the adult’s allowance: Delta (example under personal items); Alaska and Hawaiian lap infants; Sun Country (“infant bag” under personal item).
- Check the airline’s page: United (with child), Southwest, Allegiant, Avelo.
Play yards, Pack ’n Plays and wagons that don’t qualify: often count as regular checked bags (per American, Delta, JetBlue and Southwest wording), so don’t count on the free stroller rule for them.

Gate-check or cabin

Gate-check: the usual choice for full-size strollers; many airlines also allow counter or curb check. Ask whether you get it back at the jet bridge or at baggage claim (Southwest says to ask; other airlines vary, so check where it comes back).
Cabin stroller: only when the airline says so (for example, American for a collapsible stroller under 20 lb that fits the bin; United for a compact folding stroller within carry-on size; Frontier if it fits overhead). No bag brand is “guaranteed” to fit.
Cabin car seat: needs a purchased seat for the child (or an empty adjacent seat where allowed) and FAA approval labels. Exit rows (and often rows around exits) blocked. Some premium seats don’t allow car seats (United Polaris on some widebody aircraft; JetBlue Mint on certain A321 layouts).

Lap infant notes

Children under 2 may usually sit on an adult’s lap (one infant per adult; oxygen mask and row limits may apply; follow that airline’s page).
Domestic: often no infant fare; international: taxes or a percentage of the adult fare may apply (check the airline’s infant or international page for the amount).
Lap infants often lack a full checked-bag allowance (Delta unticketed children; JetBlue; United domestic; Alaska counts the diaper bag against the adult’s carry-on). The free stroller and car seat usually still apply when the airline says “per child.”
The FAA and most airlines recommend a car seat in a purchased seat over holding a child on your lap. That is their safety advice, not medical advice.

At the airport (3 steps)

Confirm the morning of travel. Open your airline’s children or special items page. Note gate or counter for the stroller, whether both stroller and car seat can go to the gate, and how the diaper bag counts.
Label it and choose where to check it. Tag the stroller, car seat, and any detachable base. Decide whether to check it at the gate or at the ticket counter; ask if you can get it back at the jet bridge instead of baggage claim.
Diaper bag before security. Know if it’s a free extra, your personal item, or counted against the adult. Keep liquids, formula, and breast milk accessible for TSA screening (airline extras don’t change TSA rules).

Calm packing tips

Pack a day-of essentials pouch (diapers, wipes, change of clothes, snacks) in whichever bag your airline counts as the personal or diaper item, so a gate-checked stroller isn’t your only storage.
Plan on gate-check for a full-size stroller. Use a compact folding stroller in the cabin only if your airline says it’s allowed. A protective cover helps; some United counters offer free bags when available.
If the car seat flies onboard, measure seat width against the airline’s fleet or seat-map notes (Alaska and JetBlue publish widths; United points to fleet maps).
Pack ’n Plays and play yards usually count as normal checked bags. The free stroller rule may not cover them.
Tip: a labeled stroller travel bag can help keep loose parts together.

FAQ

Do US airlines let you check a stroller and car seat for free?: On most major US carriers, yes. When you travel with a child, one stroller and one car seat (child restraint) are commonly accepted free and do not count toward the usual checked-bag allowance (American, Delta, United, Southwest, Alaska and Hawaiian, JetBlue, Frontier, Sun Country’s Contract of Carriage, Avelo’s Young Travelers FAQ, and Breeze’s Contract of Carriage). Confirm the gate and ticket counter rules on your airline’s page. Check Allegiant’s own page, as its rules are not confirmed here.
Does a diaper bag count as a personal item?: It depends on the airline. American publishes one diaper bag per child that does not count as your carry-on or personal item. Frontier allows adults with lap infants a second personal item such as a diaper bag at no charge. Delta lists a diaper bag as a personal-item example (so it fills that slot). Alaska and Hawaiian say a lap infant’s diaper bag counts toward the adult’s carry-on limit. Breeze allows one infant bag per infant outside the normal carry-on count. Always match the carrier you booked.
Can I bring a car seat onboard for a lap infant?: Generally only if the child has a purchased seat (or your airline explicitly allows use of an empty adjacent seat). Airlines and the FAA require an approved child restraint with the proper labels; lap-held infants are not secured in a car seat on the adult’s lap. Boosters and chest-harness “papoose” devices are widely restricted for taxi, takeoff, and landing.
What’s the difference between checking a stroller at the gate and at the ticket counter?: Gate-check means you use the stroller to the departure door, tag it there, and usually reclaim it at the arrival claim area or jet bridge (airline-specific). Checking it at the counter or curb sends it with your checked bags earlier. Some airlines (American, for example) limit how many of the free stroller and car seat you may gate-check; others allow both to the gate. Southwest asks you to tell the agent if you want jet-bridge return.
Do lap infants get a free checked suitcase?: Often no on domestic US itineraries. Examples: United (domestic lap infant: no bags in the infant’s name), JetBlue (lap infants get no checked allowance), Delta (unticketed children have no separate allowance). American publishes a free infant checked bag on international lap-infant tickets with stated size and weight limits. Never assume a suitcase allowance without reading that airline’s infant baggage section.
Are breast pumps and milk free extras?: Several airlines say breast pumps or milk coolers don’t count toward the normal carry-on and personal item (for example, American; Delta for a breast pump and cooler; United allows a pump, milk and formula with a carry-on even without the child; Avelo lists no fee for a breast pump). TSA screening rules still apply. Use the airline page and TSA guidance for traveling with children; this is not medical advice.

Official sources

American: Traveling with children; Carry-on
Delta: Children and infant items; Carry-on; Infant travel
United: Traveling with children; Courtesy bags
Southwest: Stroller and child items
Alaska: Strollers and car seats; Lap infants
JetBlue: Traveling with children; Lap infants
Frontier: Stroller fee FAQ; Traveling with a small child; Car seat onboard
Allegiant: Traveling with children; Baggage. Check both before you fly.
Hawaiian: Strollers and car seats; Infants and children
Sun Country: Contract of Carriage PDF
Avelo: Young Travelers
Breeze: Contract of Carriage PDF
FAA guidance: see the airline pages that cite FAA-approved car seats and kids travel. Read them as the airline and the FAA recommending a car seat (child restraint system), not as medical advice.

Disclaimer

Bag rules change. Confirm size, fee, and fare rules on the airline site before you travel. BagRule is a publisher site and does not sell tickets or bags.