Who in the world sizes clothes???

Ok so my soon to be 7month old daughter can happily fit herself into 18 mo carters outfits! I cannot believe it! I hope she can wear the 12-18 Christmas coat I just got her!!! when she was 5 1/2 mos she was wearing a 12mo old bathing suit. But I am completely dumbfounded right now as I look at her and she is wearing an 18 mo old Panda bear legging type pants w/o feet and a matching panda t shirt and its not even baggy! :) I will post pictures of this in a lil bit!