Welcome Jenn!!!! Glad to have you join us!
May I ask why you're supplementing Mateo w/ formula? If you are exclusively BFing on demand, your supply should keep up w/ his needs. Did you think you weren't making enough milk? It's *very* rare to not make enough milk. You can't judge your milk supply by things like -not feeling engorged -fussiness (most babies are fussy, especially in the evenings, and they like to cluster feed) -not pumping a lot (average output from both breasts when pumping *in addition to* BFing is .5-2.5 oz). As long as he's making several wet diapers a day, pooping regularly (though at 5 weeks, poop frequency can slow down), and growing, then you're making enough milk. And every time you feed formula instead of BFing, you're telling your body you don't need so much milk, so your supply will drop. I would suggest, if your goal is to BF as much as possible, that you gradually cut back on the formula supplements with the goal of exclusively BFing. HERE'S a kellymom article on doing that.
Keep in mind, also, that you don't have to have a LOT of milk in the freezer to start work, you really only need enough for the first day at work. Ideally you pump each day for the next day at work. Don't worry too much about how much you are pumping, b/c again, you shouldn't expect large amounts when pumping *in addition to* BFing. You will likely get significantly more milk when pumping *instead of* BFing, at work.
I would suggest you pump every morning after a nice warm shower (helps w/ letdown). You can do it 1/2-1 hour after nursing, or when you get up, depending on your morning schedule. Morning usually works well b/c supply is usually high in the am. If you do this reguarly every morning, your body will adjust to "feed the pump" and you should get even more milk at this pumping. You can keep up the am pump when you go back to work, and on weekends, for extra oz.
In the short term, especially if you're trying to wean off the supplements, you might try some "power pumping." See THIS LINK for suggestions.
Once you go back to work, you need to stress to DH how important i is to you that Mateo gets *only* breastmilk (assuming you're pumping a reasonable amount, which you likely will), so he needs to be smart about using it. The temptation is to give the baby a bottle whenever he fusses, but that risks overfeeding, which is a real challenge to a BFing mom. Check out these two links on bottle feeding the BF baby to reduce the risk of overfeeding #1 and #2. Expect Mateo to take approximately 1 oz per hour of separation, so probably 8-10 oz for your typical 8 hour workday plus commute.
Above all, don't stress out. All of us have been in your shoes, and we've all survived, more or less intact ;) There have been some good threads on suggestions for new moms, so check those out.
Let me know if you have any questions, it's wonderful to "meet" you!!
