My DD is 5 weeks old. Since she was born I've been waking her up every 3 hours to eat during the day (that is, if she doesn't wake up herself). This helped tremendously in getting her to sleep better at night; we now get up to 6 hours of sleep most nights.
At what point do I stop waking her up during the day for feedings? Poops, pees, and weight, are all on target for her.
I don't want to experiment with this randomly becuase I treasure the sleep we're getting!