3.) How often do you pump at work?
In the first month (DD was 3 months old), because I was still establishing supply, I had many pumping sessions. I would pump first thing in the morning (at about 6 a.m.) at home, then three times at work. You will always get more in the morning than in the afternoon, so as soon as you get to work, pump again (about 8 a.m.). Then again at lunch (about 11:30), then again in the afternoon (about 2 or 3 p.m.). I would nurse her at daycare briefly, then I would nurse her as much as she wanted when we got home. After she went to sleep at night, if I hadn't pumped enough to make all her bottles the next day, I would pump again.
Around 5 months, I went to three times a day -- once in the morning and twice at work, three hours apart.
Around 8 months, becuase she was eating solids at daycare, she stopped drinking one of the bottles I was sending, so I dropped the afternoon pumping, and pumped once in the morning and once at work, around lunchtime.
I basically followed her lead -- when she changed her eating, I changed my pumping. For example, in the beginning, I was sending in four 4-ounce bottles, but she was only eating about three ounces, so I adjusted when I felt comfortable with what she was eating. If she started drinking all of her bottle (growth spurts), I would increase the amount by half an ounce until she wasn't drinking it all again. Don't use your freezer supply for growth spurts, or your supply will drop. Pump more (at night) to get more instead.
4.) How many ounces you were getting at a time when you first started?
I pumped anywhere from 2 to 5 ounces per breast per pumping, depending on when the last time DD ate or I pumped. Always more in the morning. I would stop pumping once I got what I needed -- for example if I needed 12 ounces a day, and I got 8 ounces combined from my morning pumpings, I would stop after 4 or 5 ounces in the afternoon. If I needed more, I would just stay on the pump longer -- almost always I could get another 2 ounces after an extra 8 to 10 minutes (with a second letdown 8 to 10 minutes after the first one).
5.) What did you do when your child started sleeping through the night?
My DD just recently (at 14 months) started sleeping from 7 p.m. to 5 a.m. consistently, so I only pumped in the middle of the night at the beginning of that change, for comfort's sake. Some lactation consultants suggests that you still get up to feed the baby at night anyway; there are two reasons for this. 1.) any extra feedings from the baby instead of from the pump will help keep up your supply and 2.) if you do an extra feeding at night, the baby needs less during the day. This is called "reverse cycling."