my 3yr old DD lost her hair after a few months, then her's did not totally come back in until she was almost 18mos old. Before that she just had a little buzz cut with long hair in the back. Emilie has a ton of hair, I wonder when her's will start to fall out and how long it will take her as well. I know for myself, I was born without any hair and was bald until I was almost 2yrs old.. HA! So it just all depends. I think immediately you have the fuzzies and when it decides to completely grow in is another story..