Re: still supply issues when pumping at work...
How long are you at work and how much milk does baby get while at daycare? 12 oz sounds about right for an 8 hour workday, if you go by the 1.5 oz/hour of separation from mom rule.
It sounds like you're worried that night-nursing is the cause of reduced daytime supply- like maybe your baby's night nursing is "stealing" the milk you want to put in the bottles? If so, I really don't think you should blame the night-nursing for the drop in daytime supply. If anything, I think you should be glad your LO is night-nursing because that will improve your overall supply, and reduce your baby's need for milk from bottles during the day. The reason this is true is that your body has a pretty sensitive internal clock: it makes more milk when more is required, less when less is asked of it. And when a mom is at work, there's often no way for her to "ask" as much of her body as her baby would- and that's why those night feedings are vital. They keep her overall prolactin level higher than if baby was sleeping through.
If you continue to need to use formula, the best way to do it is to make seperate bottles. The storage guidelines for milk and formula are very different: unused breastmi can go back in the fridge, unused formula needs to go down the sink. So if you offer breastmilk first and formula second, and baby doesn't finish the second bottle, it's only formula that goes down the drain.
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