My girls are 5 1/2 months, 14 lbs, and starting to sleep pretty well. Lately, they wake up 6-8 hours after bed time and have extended moaning sessions. I don't know whether to feed them or not! On the one hand, the sessions go on for a long time and usually if they go back to sleep they wake up before too long (presumably are actually hungry) and start to moan again. On the other hand, we're sleep training and you aren't supposed to go to the babies unless they're actually upset.