What should be your weight by age is there a chart available which I can keep a track of it. I want to know what the weight of my child should be when he is born and has he is growing up. Where can I get a genuine weight chart which would tell you how much to weigh at what age? When the child is in the womb, is it possible to tell the weight of the child. What do you when your child is not the approximate weight he/she should be?