Hello everyone. Can anyone tell me who's kids were flipping over on their…

Hello everyone. Can anyone tell me who's kids were flipping over on their tummy in our age group? Our little one always lies on his back or belly, we do massages and teach him to roll over on his tummy. Progress is 0, he either stays like that or stays like that, on his belly he doesn't like lying for more than 7 minutes. On his tummy he doesn't even lie if we put him down. Is this normal? A neurologist said that if he doesn't lie on his tummy, he won't learn to roll over and turn over. What did you do to make your kids flip over?