Don’t worry
Maybe bb prefers formula
Don’t stop trying - although I know it can get frustrating and tiring
Perhaps it’s the food u ate last 2 days?
Continue trying and see where it goes
Most importantly is bb is drinking milk
Cld be perhaps lipase issue tt may have changed the taste of the milk. Not harmful to baby but milk may have a sour or metallic taste. https://exclusivepumping.com/exclusive-pumping-with-excess-lipase/