Nursing regression at 4 months?

Caryn

My lo is 4 1/2 months. He has always been a super quick eater 3-5 minutes. But lately he’s eating enough to trigger my letdown then pulling off and screaming. I do have an over supply and I know it’s forceful. But he then refuses to latch for another 20 minutes at least. He has a enough wet diapers but I am concerned they he’s never officially full. This just started two weeks ago so I wonder if anyone else is experiencing something similar.