My 2 year old is around 95/96 cm, I'm 5ft and my husband is 6ft 5in. I always worry that my son will end up being massively tall, and getting picked on for it. My husband hates his height and I don't want my son to go through the misery of that too.
He is also fair haired like his dad, and I'm worried (bit of a strong word) if we have another and it's a boy, he'll end up being short and dark haired like me, and they'll look like Del Boy and Rodney!
I'm much shorter than some of my sisters, some people are smaller so try not to worry. I'm sure the main reason you are concerned is because of ongoing health problems, but their height doesn't sound worryingly small to me. If there are any issues it should be picked up at assessment, even though it must feel agonisingly slow.
Bear in mind growth spurts too, I stopped growing at 13, whereas other people who were originally smaller than me carried on and now I'm much shorter than them, so he has plenty of time.