36 week preemie development

Anyone else have a little one born at 36 weeks?  We have our 2 month checkup this Thursday and I know they say to adjust everything to baby's original due date so technically my little guy is only a month. He's rolled over but not lately. He can turn his head from side to side on his tummy and do small push-ups. He smiles but not when prompted by me smiling at him. He gives eye contact when we feed and follows the bears on his mobile. He's always looking around at his environment. He kicks at his animals on his playmat but doesn't really grab at toys yet.  He makes cute coos while playing with his toys. How is everyone else's little one who was born a month early?  I only worry bc I'm a special Ed teacher so of course im on the lookout for all milestones.