He focuses his eyes on your face. With his eyes, he'll follow an object moved about six inches above his face.
All babies have their own internal developmental timetable.
If you have concerns about your baby's development, discuss them with his doctor. His little hand will grip your finger when you stroke his palm. This rooting instinct is what helps him to latch onto your nipple for feeding. Place a mobile over his crib so your baby can follow its movements. He's already turning his head and eyes to look at you.