I have two SW boys,  6 and 9.  My youngest was very small,  off the charts for height and weight,  I was worried, but his labs were always OK and his bone age was on target for his chronological age.  He is now 6, still small but on the charts,  I think 25% for weight and 10% for height, he is active, happy and smart.  If the labs are OK and the bone age is OK and the Dr. is not concerned try not to worry.

My older CAH’er is above average height and on the slim side, also happy and active.

Good luck