"Baby on Board" takes on new meaning when it means you're boarding your infant for a multi-hour plane trip -- complete with all the supplies you'll need to keep your baby fed and happy. The rules and regulations surrounding what can and can't be packed into your carry-on luggage may look daunting, but for the most part, they're generous -- if occasionally confusing -- when it comes to taking care of baby.
Formula and Breast Milk
Formula, breast milk and juice intended for consumption by infants falls under the category of "medically necessary liquids," according to the TSA. In other words, these liquids are not subject to the strict restrictions placed on other carry-on items, and you can carry on as much as you like. If the breast milk, formula or juice weighs more than 3.4 ounces, it must be declared, meaning that you must notify the TSA screener that it's packed in your carry-on luggage and where it's located. The screener may ask that your containers be X-rayed or opened.
Strollers and car seats can usually be gate-checked; that is, you can bring them through security to the gate where they'll be tagged and stowed for the duration of the flight. Be prepared to pass them through the X-ray machine, and remember to empty any items you might have stowed in the stroller pockets. If an item can't fit through the X-ray machine, it will probably be manually inspected. Strollers and car seats do not count against your carry-on bag limit, nor do booster seats and safety harnesses that you plan on using during the plane trip.
Parents and caretakers are also allowed to bring aboard gel- and liquid-filled teething aids as well as commercial processed baby food in cans or jars. Make sure, however, that you declare these items. There are no restrictions on number or type of diapers you can pack. Check with your airline on whether a stocked diaper bag is exempt from your carry-on limit. When in doubt, assume it does.