Josiah, my 14 month old is wearing the same size that my 2 1/2 year old is wearing in shorts. Fortunately, Liam can wear 2T shirts but the 2T/24 mths shorts still fall off of him. So, Josiah and Liam will be sharing 18 mth clothes for a little while. I thought possibly that some of the 18mth clothes might be too big for Josiah, but not so far...chunk-a-monkey!!!