Body Mass Index (BMI). Body Mass Index (BMI) is measure of body fat based on height and weight that applies to both adult men and women. BMI does not differentiate between body fat and muscle mass. Therefore, body builders and people who have a lot of muscle bulk will have a high BMI but are not overweight or obese.
The bump: or hematoma as we call it, can last for 1-2 weeks. Sometimes it gets slightly worse before it gets better. If the child is acting normally, and not vomiting uncontrollably, she should be fine. If she starts doing those things, call your pediatrician.
If your child hits his head and is (or has): 1  Under six months of age. 2  Unconscious, even briefly. 3  Crying for longer than 10 minutes or prolonged irritability.  Vomiting 1  repeatedly. Bleeding or other liquid draining from the ears, mouth, or nose.  Rapid swelling just above the 1  ear. Bruising around the ear or  eye. Unable to walk or talk normally.