A.K.
Don't be concerned. My son was so small and still is one of the smallest kids in his class. He is 6 and just hit 40 punds about a couple months ago. As long as he is eatting properly there should be no reason for worry. Even though, as moms that is what we do. I still worry about my son. He is one of the smallest kids in the 1st grade. My ped. told me that if after awhile that he hit 0% on the charts and he stayed that way for a year or so then there should be cause for concern. All kids grow at different rates. He'll have his day and then you will be wishing he were a little tyke again.