Hi my baby is hitting the 8 months in two more weeks but he has yet to crawl. He doesn’t like to flip over on his tummy when placed him the playmat and only do so when he is on the mattress. He can slide backwards or in a round direction but not yet know how to move forward. So far he only sit and play his toys. Not knowing how to move from sitting position to tummy or tummy to sitting position. Everytime He will cry if he is on tummy for awhile as he doesn’t seem to dare(scare he doesn’t know how) to flip to his back from tummy. And has to help him lie on his back or help him sit. I am worried for this case. Any mummies out there can advise?