Hello and welcome to Share!! Congratulations on the birth of your son Nathan! He is adorable!! I would say it can't hurt to talk to your doctor about it if you are concerned. That said my full term son did not do a real crawl until he was 9 months old, though he did roll around and army crawl some prior to that. But if you're concerned, bring it up to your doctor and see what his/her thoughts are on it! I look forward to getting to know you more!