Yep, it's the magic 4 month mark. Lots of babies change when they hit 4 months. DS2 became unsettled and his night sleep went out the window. I had BF'ing probs with DS1 at the same age, he seemed hungrier and I couldn't keep up. It does pass! By 5 months DS2 was sleeping through the night again.

I think they become more aware of the world around them at 4 months old and it can disrupt their sleeping or feeding.

This is a phase that will pass, I promise!