Girls, who's been through this, the baby used to fall asleep peacefull…

Girls, who's been through this, the baby used to fall asleep peacefully on the breast during the day, now he gives it and starts fussing, turns over and cries, falls asleep with difficulty and that too for 30-60 minutes, what's happening I don't understand, everything is in his mouth, fusses, gets angry, eats like a pig on Kosh, already my head is spinning.