Re: question about supplimenting with formula
I'd ask for more information about the situation before sending in more milk. Why do they think he's still hungry? Are they mis-reading cues? Or is he finishing the bottle faster? Maybe the bottle nipples need to be replaced - the holes can open with use and washing, making baby go through the milk faster.
If you do decide to send in supplemental formula, consider putting the formula in a separate bottle, so if baby doesn't finish the bottle, they are throwing away just formula, not milk that you've worked so hard to provide.
Most infants in daycare need 1-1.5oz of milk for each hour they are separated from their mother, so 4 4oz bottles should be enough for your baby. Every baby is different, and not all babies follow this pattern.
Before adding formula, investigate other causes for baby to want more.
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