My 19-mo old is a little guy too, but has been consistent in where he places on the growth chart (bottom 10 percent). He only gained a pound from 15-mo to 18-mo, and wears 9 mo-12 month clothing. We are curently going through tests and have ruled out CF and celiac. We see the pediatrician on Thurs at which time I am going to ask about an endocrinologist or GI doctor. I work in health care at a large hospital and have surveyed what seems like all of my 5,000 co-workers (LOL) and from piecing together the stories and advice, this seems like the way to go.
Even if you are against growth hormones, it is worth seeing the endocrinologist and hearing what the options are. Several co-wokers chose not to take their kids at all to such a specialist because they were turned off by the hormones, and all of them now regret not going because they feel they may not have heard all the information to make an informed decision. Even if that decison meant not to proceed w/ the hormones. One co-workers daughter did not take hormones and obly grew to 4'10" on a good day. My co-worker really regrets not seeing the doctor. She just thought her daughter would "be short". But what is "short?" My co-worker thought 5 foot, not 4'10.
My husband is 6'1" and I am 5'5" so we were not expecting a short son. Especially when his 3 yo sister has skies for feet and looks like she could join a women's basketball team right now!
My advise is to see all the specialist recommended to you by your ped and then make an informed decision either way based on what they have to say.
Good luck, and I hope we both find answers to children's height issues!