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.
My baby is 3 months old, and I noticed a bump on his head about 2-3 weeks ago..It is squishy, like a bubble of fluid-when you push one part of it, another part moves. It doesn't seem to bother him, and the pediatrician had pretty much the same response as every one else's doctors have said.