MY 6 month old SON not gaining weight

My son is 6 months old. He is about 24.4inches but only weighs around 13.22lbs; im looking for any tips on how to get him to gain a couple pounds i just feel he is really skinny for his age compared to kids i see that are the same age .... I am concerned a lot, please help?



My son was born jan 13. He has been unable to gain weight properly since birth. His birthweight was 5lbs 6oz. We have seen endocrinologists in Fargo and Bismarck as well as peds...