He started propping up on his pillow at about a month old. it really helps with their neck mucles so they can start holding up their head! once he got to about 2 1/2 - 3 months I started putting toys in front of him so he could start using his hands and arms!

@mommy2liamandnoah, awe how cute! I have one of those pillows too. At what age did you start propping him up like that? I wanted to but wasn't sure when I could.