Sterla - you sound like such a great Mum to your little boy you are doing everything perfect.

My DD is only a little older than your DS and only just rolled over a week ago and has only done it once. She is too busy checking out everything and faces etc to care about rolling too much yet She's just learnt how to blow raspberries and squeal so she's concentrating on that instead of rolling I think!

As long as you are playing with him and encouraging him along, placing toys in front of him that he can try and reach out to grab etc, plenty of tummy time and back time etc then he will soon learn to do the rest.... have fun!