Is my baby hitting milestones okay?

He rolled from tummy to back at 4 months and only rarely does it still at 5 Months. He hasn’t rolled from back to tummy yet. He has good head control but looks down a lot when he is propped up. He cannot sit up on his own and I don’t think he is close to doing so either.

Is this an early sign of autism? Or is this normal behavior for a 5 month old.

Thank you ladies.