just in case ordering from Boots past security only works if you're flying direct to MCO if you are flying indirect, you'll need to go through security again at your connection airport in the US, and you're back to square one.
You can take baby milk through US security too so no issue with cartons there either!
Travelled with drinks for DDP until she was 2 and never had to taste any going through in the US :
agreed but that was not my point
IF OP plans to buy at Boots past security in order to avoid carrying it through security (even though it's allowed), and have to clear security in the US as well, then OP might as well take it from home to begin with
You can take baby milk through US security too so no issue with cartons there either!
Travelled with drinks for DDP until she was 2 and never had to taste any going through in the US :