You do not "HAVE" to take anything they recommend UNLESS... you do want your son "to grow" more.
AND, sometimes the Doctor will just recommend something because the parents are anxious or demanding something.
IF the Doctor does not see anything "wrong" with your son's development... then I don't think you should worry. As you said, you and your Hubby are not tall people. Every child also goes through varying degrees of growth-spurts etc.
I'm assuming, that at each well-check exam, your son's height/weight was taken and the Doctor didn't find anything wrong with him? But, per your Husband, YOU are the one who brought up his height? So, you have to decide, if this is something REALLY to worry about, or not??????????
We have seen a Pediatric Endocrinologist before for my daughter. But for different reasons. Anyway, if your son's "bone age" is fine, then you should be VERY happy. Then, my understanding is that hormones can fluctuate. Especially in young children. So... ASK if this is a "normal range" to be in... or not???? And ask what IS the NORMAL RANGE for that particular hormone to be in, AND IN COMPARISON, where is your son's level? Or, are they just grabbing at straws to tell you "something" about your son, so that he "can" grow bigger, as your Husband seems to want? Either way, the Doctor should explain this to you explicitly.
Taking growth hormones... is not something to take lightly. Like everything, there are pro's and con's, and side-effects. ASK ABOUT LONG-TERM impacts upon the child, if taking the medication? AND there are many different kinds of growth medications... ask about which one is most harmless, so to speak.
Then, like any child, growth is hereditary and an individual thing. At a young age, there is no way to absolutely predict how large/tall your son will be. Most boys, grow rapidly in middle school. Many boys may start out smallish, but then in the blink of an eye, catch up later.
CAN the Doctor PREDICT your son's future height or the impact of the growth medication?????
AND... is this a "serious" medical problem, or just a cosmetic issue and a personal hope that he is taller???? Or is it just something that your Husband seems to think is a problem? Is your son's height/size a problem for you, personally? So, there has to be a determination, that your son's situation IS INDEED a "TRUE" medical "problem" or not.... and does it 'have to' be treated or not? What is the future prognosis?
If it is not a medical "problem".... and just a hope that he is taller, then I would really consider if you want your son on growth hormones or not, and IF it is REALLY ABSOLUTELY necessary?
All the best,
Susan