baby starting to crawl and sit up

My 7months old starting to crawl and sitting up on her own. She is in infant care now and fell down twice last week and 1 time fell on her back and hit her head. Luckily LO is fine after hitting her back of her head. Her ifc is wood flooring. Her care giver unable to give her 100% attention because there are still other infants that they need to handle. How to refrain LO from falling? Is it normal at their age to fall. #worriedmum