We are going to aruba on the 23rd, and traveling with my 6month old and 3 1/2 yr. old. We took my son at 6 months also, and ran out of formula the last day. He was on Similac, and they did not have it. we did find good start and enfamil. my docotr told me that the formulas are interchangeable, soy similac is the same as soy enfamil. not sure if that is true, but I am packing a big can in case.