Girls, who have babies 4 months or close to 4 months old, do you exper…

Girls, who have babies 4 months or close to 4 months old, do you experience crying fits during feedings? We've got some kind of... started, it's been about 5-10 minutes calm, then crying fit... screaming, can't quiet them down at all. I thought maybe he wasn't well-rested, but even after a 2-hour nap, he cries. Even on his arms. Development leap + regression in sleep? How long does this last?