The best way to know that baby is getting enough is by looking at wet diapers. 6+ wet diapers per day means they are getting enough.When bottle feeding, baby needs about 1-1.25oz per hour (so if it’s been 2h since their last feed, 2-2.5oz is all they’d need.) Look up “pace fed bottles” for info on a bottle feeding method that more closely mimics breastfeeding. It helps avoid over feeding and bottle preference. Whenever baby gets a bottle, you should pump around the same time to maintain your supply.If you are pumping between nursing sessions and not missing feeds (eg 10:00 feed, then pump, then feed again at 12:00 without giving any bottles) it’s normal to get 0.5-1oz total. Anything more than that is oversupply.If you want to build a stash, it’s best to start with something low suction like a Haakaa to collect letdown while you’re feeding on the opposite side. That way you can collect enough for a few bottles over the course of a few days, but won’t encourage overproduction. Don’t forget that whatever you feed baby in a bottle you’ll be replacing by pumping while you’re apart anyway.

What are you pumping for? Is it on top of nursing? Is it for a feed? Are you exclusively pumping?

That’s enough to build something. It will take a while to build up a stash. I built mine soon as we came home. I’m thankful I did. I was gone a week with my daughter who was hospitalized 3 hours from home. I would feed and then use the haakaa to collect more. It was usually around an ounce or so. Maybe a little more. Now at 11 weeks I can get 2-5oz, that’s on top of feeding him. I don’t collect at every feeding either. I was like you, I wanted to have a little something going so dad and siblings could feed him.