My baby also cannot turn, actually when he was 5 months, he can turn over on his right side but since he reached 6 month, he never do it again. Even if we put his toys to induce him turn, he give up ah.
I am not sure if it's becuase he is too fat and heavy now! Lazy boy!
my bb girl also cannot and not willing to turn. She is nearly 18pound la!! Big size.
The Dr said there is no other method other than encourage her to do. Dr afraid this will hinder other development too so I'm quite worry.