Soft tissue injuries, typically to the head and neck, were among those most frequently seen, according to a 2011 study of injuries related to cribs, playpens, and bassinets in children under 2. These tend to be caused by falls from the crib, which is why it’s important to lower the mattress as your child grows and ensure there aren’t toys or bumpers in the crib that can be used to climb out of the crib.