the average newborn triples his weight by
You will be told what percentile your baby is in for weight and height, compared with other babies of the same age. For example, if you are told that your baby is on the 90th percentile for weight, it means that he weighs more than 90% of babies his age. A useful rule of thumb is that most healthy, full-term newborn babies double their birth weight by four months and triple it by their first birthday.