How Much Formula Does a Two-Month-Old Eat on the 19th Day?

The baby is two months and 19 days old, eating formula, with bowel movements two to three times a day, sometimes twice. There is a little breast milk, but it’s not enough for one feeding. However, he always wants to suckle on the breast to fall asleep, even if there’s no milk, he still wants to suckle. He used to never do this before, and he was doing well with formula until it was time for a nap. For the past two days, he hasn’t wanted to eat formula much, just breast milk. There was nothing we could do but let him cry until he finally ate formula. Today, he completely refused to eat formula. I don’t know if the formula I bought online is sweeter or what, but this morning I fed him formula from a baby goods store, and it’s the same brand, but he won’t eat it. He just wants breast milk. He only ate 120 milliliters from morning until 5 p.m. Do you know what’s going on?
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