9mo baby not crawling

My 9mo baby doesn't like to be in tummy time position and still find it hard to push himself up to crawl. He can rollover,sits very well but all he wants to do is stand up and trying to learn how to walk because he likes playing with his older brother. And he hasn't start babbling. I'm worried and overthinking a lot because my 1st wasn't like this. But my 2nd seemed to have delayed milestones. Anybody experienced this before? Is this normal?