6 month old, developmental delay

I have a very happy 6 month old but he isnt quite doing the things a "typical" baby at his age does. And I know, every baby is different. But I was wondering if anyone is in the same boat? He holds his head up okay, but doesnt reach for toys, doesnt hold his bottle, doesnt sit up. He rolls over from stomach to back and he can almost roll over from back to stomach. He doesnt make eye contact either. He has a doctors appointment for his eyes in April. I think he is farsighted because he looks at things that are slightly farther away. Is there anyone who had this happen? Or are currently experiencing this?