I will tell that I have never had a problem bring a bottle or sippy cup with milk (and actually juice) thru security for DS. I have even had juice boxes in my bag (as part of a lunchable) that I didnt realize and TSA asked me if it was for my son I said yes and they let it thru. Not to say you will have same experience but we travel a lot and never a problem.
Also an idea. Stick the milk in the freezer so when you go thru security it is a solid and you shouldnt have a problem. I just did this with water and TSA said it was totally fine since it was soild.
But I dont know about customes so you have to check that.
Also an idea. Stick the milk in the freezer so when you go thru security it is a solid and you shouldnt have a problem. I just did this with water and TSA said it was totally fine since it was soild.
But I dont know about customes so you have to check that.