He has rolled a few times but just isn’t interested. If I start to roll him (pull his leg to the side) he will finish out the roll like he knows how but won’t do it willingly or by himself. He has rolled more around 2-3 months than he has between 4-6. He is, however, sitting unassisted, pivoting in tummy time (he does A LOT of tummy time as he enjoys it), he pushes up on his hands, he can kneel & stand, turn himself in circles, will go on all 4’s with assistance, & even go from sitting back into tummy time. Should I be worried? Should I ask for a PT referral if he’s meeting all other milestones? He’s also 6.5 months adjusted as he was 4 weeks early.