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.
They are seen in many healthy infants and children beginning at an average of 6-9 months of age. These behaviors typically subside by age 2 or 3, and by age 5 are only still seen in 5 percent of normal, healthy children. Although head banging appears alarming, the child seldom inflicts significant damage to the head.