 [ Symptoms ] my 2 year old son is tall for his age but only 50th percentile for weight does that mean he is underweight [ Disease ] if your child is bmi percentile is in the healthy zone then congratulations it sounds like your child is at maybe the ~90th percentile for height and a 50 weight so that might be around the 25th percentile for bmi if the trend is good then your child is growth is tracking along a healthy path children who have 2 parents with weight issues are at higher risk of obesity that is 13 times higher than the baseline so you are doing a great job just like i would counsel parents with a child at the 75 or 80th percentiles not to worry likewise feel good about your child being at the 20 25th percentile