K.H.
He is perfectly fine! It is said about preemies in their first year that you should take into consideration how early they were so he is 8 months old but is more like a 6 month old because he was 8 weeks early. He will catch up soon after his first birthday. I have a 36 and 37 weeker, they both caught up just fine. Don't stress about it all babies develop at their own speed!