You'll be fine! Unopened formula is no problem. If it was open, they'd probably check it with the strips of paper they use. But as long as you have a lap child, you're allowed to go through TSA with full liquids for feeding them
@Gabrielle okay and Washington but where I’m going I have a layover in Seattle sadly
I’ve flown to the US and internally almost every month with my baby. She’s 2.5 now and I’ve never had an issue with TSA and her formula, liquids etc. Anything for baby is medically exempt and unweighed, they won’t bat an eyelid at loose formula and flasks of water
I always bring ready to drink formula. I put the bottles on a ziploc bag inside the diaper bag. They do check them doing that pad test but they don't open them. No problem at all. I usually bring 4 small bottles of formula plus powder. Always have a back up in case it spills or whatever. Don't ever risk running out of formula on a flight. My sons first flight was when he was 5 months old. It was a great flight but he drank a lot of milk, double his usual amount.
You’ll be fine. If anything they will ask to test anything that is open. Watch them like a hawk and tell them not to dip anything in your water or formula. They should be hovering over your water and open formula but they are not aloud to actually grab samples. I use to freeze my water and bring it through just so I don’t have any problems with the water.
They let you in, bring your own hot water in a canteen if you can. Like the one you store soup. That’s what we do on flights. :)
Bring extra too! Incase of delay or flight. I always bring enough for two days of travel
You’ll be good. I’d suggest leaving it unopened until you go through tsa if you can it’ll be easier to get through. I’d also add water to each bottle the amount that you need so it’s already there and waiting. Or bring like two water bottles with you like the plastic ones unopened. You’ll also be good with that. Where are you flying to