My friend was not very short but not tall when she was young. Now's she's quite tall 5'7".
My brother was usually queue in the middle (ie. average height in the class). Now, he's very tall more than 6'. My parent and I are not very tall, just average.
I think it's difficult to say now. Some maybe short due to 天生, but some may able to be improved with sports. I was almost the tallest in my class but now I'm just average. My boss's whole family are tall but she's short (she's not too short when young). Don't worry too much now. The most important thing is our children are health and happy.