My DS is 13 weeks old. At 10 weeks he started to sleep through the night from 7.30pm until around 4am, wake to feed then go back down until 8. But about a week ago he started waking at 1ish for a feed as well. A week later and he's increased to waking three times a night. When he wakes, he seems really hungry. I'm 100% breastfeeding & starting to feel the tiredness creeping up again, and wondering why he seems to have taken a step backwards. I've heard of the 4 month sleep regression, but surely this is too early?