Specifically older babies (6+ months)

Ugh, LO2 who is 8 months old has been pooping in the middle of the night. She poops plenty during the day but I guess she needs to poop at 3am, too. She has been doing this for a few weeks now, but I'm really hoping it's just some sort of phase. It's not fu changing diapers half asleep, but at least she's regular

Does anyone's LO do this? Or if your LO did do this, did it ever stop, or did it become a nightly habit? My only fear is she will continue to do this and never STTN again!