My 10 mth old is sitting & crawling and she is bumping her head a lot this week 2x once on kitchen floor and once on her playmat with pillows.worried?

Not worried: Toddlers fall a lot. Short distances (like less than the height of their bodies) should not cause a problem other than bruising. Generally the kids cry immediately and can be comforted. It takes more force than a short fall to the floor to cause significant damage. That being said, if child is inconsolable or not acting right, have her checked out by a doctor.