DS is 15 months old and is only 29" tall. Last I checked, that's not even on the charts. Should this warrant a trip to the doctor? He is 24 pounds and is still not very interested in solids, but he nurses a lot. He seems to be on track developmentally, he just started walking this month and he says a few words. I think I am mostly concerned because DD has always been in the 99th percentile for height and weight. We don't vax or do well baby visits, but I do have a good ped. Should I take him in or not worry about it?