Question from Los Angeles, California, USA:

My son is on a pump with Humalog. He got diabetes three years ago at the age of 11. His control has always been great. His A1c has always been between 6.2 and 7.2 every month. He has been very healthy. He is a tremendous athlete and everyone who sees him says his body is the picture of health. He has always been tall and has been growing great, but he stopped growing at the age of 13 and hasn’t grown in a year. He is gaining muscle weight and has become very strong with big muscles. He started puberty at 12 years old and is getting some facial hair now. He has always been tall, 95th percentile his whole life. Both of his parents are tall. I’m curious why he stopped growing. Do kids stop growing at the age of 13? Did he stop growing because of diabetes? Does insulin stop the growth hormone? He eats a lot and always eats right before bedtime. Can bolusing right before bed stop the growth hormone? Are there tests we can do?