Mommies, we're trying to switch our baby from formula to pure breast m…

Mommies, we're trying to switch our baby from formula to pure breast milk. She's 2 months old. We were feeding her 120 in the morning, 90 during the day, and 120 at night. But she doesn't always finish everything. The last two days in a row, she's been sleeping without formula. I weighed her on Saturday, her weight was 5.480. Today it's 5.495. That means 15 grams in two days (she should have had 40). Do you think we should continue not to feed her at night? Or do we still need to? I'm afraid she won'