My baby is almost 6 months actual and 5 months adjusted, he is a rolly Polly and he can move around the entire floor space by rolling and just pushing his feet, he's lifting almost his entire belly off the floor now, but we've seen no progress towards sitting in our own. Whenever I try to have him sit down and see if he can hold the position for any period of time he'll arch his back and slide his butt forward and will not stay in a seated position. He definitely seems like he should be able to sit alone for at least a small period of time but the second his butt is on the floor he's trying to get off it back into his belly/ back and idk what to do to help him sit by himself.