Baby stop cooing but scream instead

Hello! This is normal :") baby is playing with volume and preparing for speech production. Just to clarify though - that baby is happy screaming or squealing!! If screaming in distress then might indicate pain or discomfort somewhere. My baby is 4 months old and he squeals every wake window LOL I think it's the cutest thing ever hahaha just remember they are trying to respond and communicate with you!