My ds was born 4 weeks early and in the first few weeks we had a lot of problems with his weight loss, jaundice, reflux and feeding. Since then he has gained lots of weight and is a big, chubby, happy boy, who never stops gurgling and blowing raspberries! The only problem is he doesn't roll... he did it twice in a row from his tummy to back about a month ago which we managed to film, but since then hasn't done it at all. He screams blue murder when we make him do tummy time and always has done. But despite him hating being on his tummy, he refuses to roll out of that position. He is able to lift his shoulders but after screaming for a few mins, will generally just put his face into the mat and sob. Should I be worried? He only really rocks from side to side when he is naked before bath time, and the rest of the time will just lie on his back happily holding onto his toes. He also doesn't seem close to sitting independently either. My daughter had none of these problems and hit all her mile stones at the right time , so I'm just a bit unsure whether this is a sign of a problem or not. Would love some advice and also any tips on how to encourage him to move! Thanks.