Hello everyone! Girls, could you please tell me if my son is one month…

Hello everyone! Girls, could you please tell me if my son is one month old and started taking breast milk poorly. He's fine during the day, but cries a lot when he sucks on the breast in the morning and evening. I started supplementing with formula in the mornings and evenings, and the baby became calmer and falls asleep almost immediately. (I feed him only breast milk at night). Does this mean he's not full? The milk comes out well, but he freaks out when he sucks on the breast, while with formula he calms down right away. I'm afraid he will refuse breastfeeding altogether.