I go back to work and am curious on what your night duty schedule is. DH works M-F, so I am the one to get up at each feeding for LO, and then DH takes the 6am feeding on Sat/Sun. Do you share the responsabilities with your SO, do all the feedings/changing/soothing on your own? What have you found that works best for you?                
                             
        
Re: What's your nightime schedule?
When DD was little, we split the night duties. DH is a normal night owl and I'm not, so when I went back to work he would take 9-midnight or 1 (I can't remember which) while I was asleep. In the beginning he would literally stay up to midnight to make sure he didn't sleep through a turn. Then if I heard crying anytime after his "shift" ended, it was up to me to get up and take care of the situation. We had bottles on hand so DH could feed as needed while I slept. Doing it all yourself doesn't seem reasonable if you're both working full time on similar daytime schedules.
(And to this day - DD is 4.5 years - I do almost every Saturday and Sunday morning with DD while DH sleeps because he just doesn't function before 7 am.)
multiple nighttime wake-ups - DH took 10-2 and I took 2-6. Doing all feedings, changing, soothing during your allotted time (exception if the baby was up crying all night or something)
2 wake-ups a night - DH took the first one, I took the 2nd one
1 wake-up - alternate nights
random wake-ups - alternate turns. we are at this phase now. we switch who has the monitor each night. DD rarely wakes up during the night anymore, so it hasn't been a big deal.
DH is a night owl and I'm a morning person so that's how we decided who has what shift. We would also switch things up if one of us traveled or if one person had something going on at work where it was important to get a full night of sleep.
We also split the weekend. DH gets up with the kids on Saturday mornings and I get up with them on Sundays.
On weekends we do try to take turns letting each other sleep in.
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Until DD was about 10 months and was fairly reliable about STTN and not needing to nurse if she did wake I did all night duties. I went back to work when DD was 4 months and DH had a job where he needed to drive a truck all day. We just couldn't risk having him sleep deprived. That said, those 6months were pretty much hell for me. If there is a next time, DH WILL have to pitch in more. DD was a night owl and took hours to get to sleep at night and was still up once a night. I basically didn't sleep more than 3 consecutive hours her entire first year, either because she was awake, wanting to nurse, or I needed to pump, or get up for work.
Now a year later, DD being a night owl is really nice, because we pretty much all get up as a family on the weekends. DD goes to bed around 8:45-9:30pm and she wakes up between 8-9am. So, that let's both DH and I sleep in on Saturday's and Sunday's. If by some chance she wakes up earlier than 8 (a very rare occasion) she is very happy to just play and talk in her crib for about 30min.
When DS was really little and needed a diaper change along with a feeding, I'd get up and feed him and DH would then take over at least once or twice and change him and get him back to sleep. Once diaper change was no longer necessary, only I got up to feed and put him back to sleep. When DS switched over the formula, DH and I alternated (just whoever wasn't super tired would get up). Now that DS doesn't need to eat and just needs comforting, DH gets up. That only happens once every few weeks though.
On weekends, we take turns on who gets up with DS and who gets to sleep in. DH is very good with helping out.
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It was easy enough w DD1, she only woke up once at 3am, ate and went back to sleep and started STTN at 9 months.
DD2 is much more difficult. She's 5 months old and still up 3x a night. For a while she would just be awake for a couple hours in the middle of the night. DH has helped out when I was completely losing my mind. But I'm just pretty much living in a never ending state of sleep deprivation. It's a good thing that nursing produces a lot of feel good hormones. I'm sure we'll have to try CIO eventually, but I'm not quite to that point yet. I'm sure most babies aren't this bad though.
Our routine:
DH picks up from daycare 5:20 (I do drop off in am)
I get home around 6:45
DH cooks dinner, I do dishes
Bath time 2x week together typically
Once LO seems tired 8:00-8:30 I nurse, change into sleep sack, read or listen to music then bed.
Honestly, when LO wakes at night I wake so I'm ok with being the one to go to her, and typically if she wakes she wants to nurse.
If work schedules require we switch drop off and pick up but late night is me for now.
If we were doing ff then we would probably split the nights