Long story short: DS is underweight. It started after he had his first cleft palate surgery (there were a lot of feeding restrictions afterwards) and he had multiple surgeries that continued to interfere with weight gain. For a while, he wasn't growing height-wise either. When he was about 5, he reached average height, which was a huge celebration for us. His weight did not keep up, though. He's been evaluated by a pediatrician twice for diabetes (the first time it was a finger prick BS check in office and the second time it was a blood test in a lab) and was cleared both times. Other than that, we haven't really tested him specifically in regards to his weight issues. He has made significant progress over the last two years, having banner weight gain years for him. However, he's still significantly underweight. His BMI is around 13, which is 1st percentile for his age. His weight is 5th percentile for his age and his height is 35th. I wish his height wasn't slipping again, but 5th percentile is on the chart, so that's better than usual for us.
Probably relevant here is that DD1 is 97th percentile for height and 68th for weight. She's a big kid and always has been. DD2 is 65th for weight and 99th for height, even with a cleft and a couple surgeries to go with it. I'm pretty tall and my DH is tallish (though not super tall.) i expect to have big kids, genetically speaking.
A mom friend of mine has a boy a lot like mine. Both our boys spent some amount of time in behavioral feeding therapy as toddlers. Both of our boys linger at the low points for weight. The major difference is that that family is actively pursuing medical answers to their son's weight problems. It has me wondering if I should be paying more attention to this. i have periodically checked his blood sugar because he struggles with hypoglycemic attacks (which our pediatrician said are due to his low body fat percentage) and it's maybe borderline low when i check it, but never too low. it's never been high. I think I've just always put it down to DS' tough start in life (9 surgeries in 3 years, a dozen or so hospitalizations) but if I'm being honest, he hasn't had those kinds of issues in years now. Should he be catching up?
Should I start pursuing this? He went through so much when he was little and i sort of avoid putting him through anything if I can help it now. If you would pursue it, where would you go? My friend is seeing an immunologist for her son. I'm not sure if that's what I should do? Maybe an endocrinologist? or just his pediatrician? Anyone with insight?