When I got my little pied girl at about 2 months old, she was 102g and about 12 inches. I fed her every 3-4 days on a 10-15% rat and she went from that 102g skinny little girl back in November to her now round self of 433g and about 30 inches. its amazing how fast she grew. Since hitting the 433g I have moved her to a once a week feeding of a weaned rat. I personally think as babies, its hard to really overfeed them as this the time when the most rapid growth happens, then it slows down considerably after a year thus why you put them on maintenance schedules and the whole 10-15% goes out the window. Also each snake is different so you just got to physically assess each one and make sure he/she looks well rounded and overall good. If he seems hungry right after feeding, maybe next time up his rat size a little. Plus babies always seem hungry. Dot always acted like she was starving and would stand up out of her hide like a cobra and strike the air around the top of the cage when I opened it and that was feeding her every 3-4 days with the 10-15%. Now she has mellowed out a lot but still likes to eat, just doesn't act like starvin' marvin
And as for hides, I found the RBI large one works perfect for Dot at about 30". She absolutely loves them and bounces from the warm one to the cool one a lot. She also loves to sit on top of them at night.