6-7 month old milestones?

Se

I was wondering what other 6-7 month old babies are learning and doing. My daughter can squeel and make "dinosaur" noises lol, she can roll, army crawl, and rock on her hands and knees (But can't crawl yet). She hasn't started babbling yet (like mama dada or baba), she hasn't pulled herself up on anything but has tried. I try and hide her toys partially under blankets and she usually has a hard time finding them or loses interest fast. Should I be concerned?