@Bonnie this. When I was teaching my daughter I’d put 1 hand behind a foot and let her push off
my son army crawls!! we have carpet, but I watched him practice on my bed by pulling himself forward with the covers. He knows how to crawl on his hands and knees, however I think right now he prefers to army crawl.
U can also get a towel and help him crawl I did that with my daughter
Push her feet up to her booty like in a frog position and let her push herself forward off of your hands. It helps get her to use her legs to move and lets her scoot to get toys out of reach