I am also back at work. I really hate going back; I want to be at home with my little one! The plus side is, DH is mostly unemployed at the moment, and can stay home with him, so no daycare! and I work from home 3 days a week.
I am fortunate to be in a workplace that has actual lactation rooms, complete with recliner, magazines, cd-player, sink, and fridge, so that is very nice. so I pump twice while I am here, on the days I come in, and that milk is used for the next day's feeding. I have some milk frozen, but especially since I've come back to work, I feel less like pumping when I'm home, and just want to spend that time with the baby.
Thankfully, he has started sleeping through the night, well, my night anyway, as I go to bed around 11 or so, and he has been sleeping to about 5, or 5:30. We don't really have a set schedule, as sometimes he goes 3 hours between feedings, and others, as much as 5 (not counting night time). He is a very good baby and that helps alot. DH is still sometimes struggling a bit the rare times he gets fussy while I'm gone, because when he gets that way, he's pretty inconsolable. but they do manage, day by day.
The most important thing I've done to "prepare" is to allow other people; the grandparents, dh, etc, to try to comfort and soothe him even when I'm there. It pains me to watch sometimes, because I know sometimes he just wants his mommy

but it is something both he and I have to adjust to. Now, after a few minutes, if it is just not working, I'll take over, as there is no need for all of us to suffer endlessly, but it's usually not necessary.
- Katrina and Gabriel - 8 weeks old
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