Breastmilk and patience. His body is adjusting to not having your hormones, and the drop causes this breakout. But he is gorgeous, mama...absolutely stunning.
Since birth I have wiped my sons face, hands and feet with a warm washcloth every morning and night. He's never had any baby acne or blemishes at all. Try washing his face daily with just water to see if it clears up.
thanks @tayek