L.W.
Hi. All babies develop at different rates. My daughter never crawled. She not got up on her knees from her belly. She would lie on her belly, arms straight out in front of her and her legs straight behind her and pull herself along the floor, but rarely. My daughter didn't even do this until she was about 10 months old. 5 days before she turned 1 she was standing holding onto the couch and she just let go and walked. She never crawled. Even to this day, she is not a great crawler and she is 3! But she is healthy and extrememly active! So relax and just enjoy your baby. Keep encouraging her by playing on the floor with her. Most likely she is fine and will move when she wants. But definitely ask the ped. at her next appointment. Take care.
PS I know it can be a little disappointing when you see other people's kids crawling and creeping along and yours just sits there. I've been there. My daughter also never really cared to roll over at the age that most babies do. My son, who is 6 months, is the complete opposite of my daughter. He won't sit still! Go figure!