disagree, el cochinito. pediasure should not have to be (and, per TSA regs, is does not need to be) medically necessary in order to carry on for someone travelling with an infant. however, you might encounter some resistance, depending on flight time. sounds like you're flying to Japan from the US, so a 6 pack does not seem excessive and you should, hopefully, have no issues. i would chance it. erictank's suggestion also seems prudent, though.


EDIT: realized i misread the OP's and cochinito's posts. since you are not travelling with your child, you will have to check or ship the liquid pediasure. or, bring the powder, per erictank.