M.M.
My step-daughter is going on nine and she still wets the bed. I think we are hoping she just grows out of it. There are different things we have tried that helped, but we haven't been consistent in these things. One being "no more fluids after seven" and the other is waking up and or before going to bed getting her up again... I remember I must have been 10 the last time I wet my bed; don't think I did it often at that time, still that's pretty old. It seems to me kids range differently in this, as far as some have a problem with it for a long time and others it just doesn't seem to be a big deal.
Our daughter still goes back to her mom's on the weekend, so it can be hard to be consistent, not to mention we haven't made it priority here. I guess we are just letting it go for now. We have a four month old as well and so sleep is precious these days.
It is part of our daughters chore every day though to bring her bed sheets to the laundry area and wipe down her plastic sheet. I also have her load the washer and change the loads and fold her stuff sometimes, all supervised... My hope is that she will grow tired of changing her bedding every day and having to take a shower every morning because she has to for the pee on her.
As for the day... I just tell her to go. I don't ask her anymore whether she has to go to the bathroom... she'll say no or that she can old it, so I just tell her she needs to go right then and that has helped I think with the daytime accidents.