Apparently my baby also has his own “period” or “mood” sometimes drink very good sometimes few days suddenly never finish milk, or drop by half. But the next few days back to normal. Doc say as long as active, not weak, good diaper output means not dehydrated
No tips. If baby is active and peeing and pooping well, nothing to worry about. There will be times when baby drinks lesser milk. It’s a phase and it will pass.