6 month old.

Mary • Mmc January 2018 👼🏻 mommy to baby mooney👶🏼

Ok I need help. My son about to turn 6 months old on the 20th this month. Well I was going through his milestones check list that his doctor gave me when he was born. I noticed he not rolling over. He won’t roll over from his stomach to is back. Or back to his stomach. Should I be worried??