Premie development

Allexus

Hi ladies , I had my 2nd baby boy at 34 weeks . He is now 8 months old and extremely active but I’m am concerned on some milestones. My 1st born was full term and very advanced on developing and did things a lot quicker then even doctors could believe. So I’m not sure if I’m expecting my second born to do things similar. I do account that he was premature and it might be why it’s taking longer for some milestones. My real question is should there be a point of concern ? And when did your baby begin crawling?