My little one refuses tummy time - she has learned how to roll from back to front and almost immediately rolls out of it or fusses. Once she's on her back she kicks happily. She does well with fine motor skills - grabbing things, moving between hands, bringing to mouth. And she is doing pretty well sitting up unsupported (still needs us to be nearby as she is still wobbly).
How did you teach your babies to crawl if they refuse to be on their bellies???
Re: 6.5-m.o. refuses tummy time - help!
My niece was the exact same way. She's 9 months now and crawling all over the place like a champ!