DS1 was 8 months, although he was sleeping well before that, barring 6 weeks of the sleep regression he woke once a night from 6 weeks ish.
DS2 can easily go 4 hours inbetween feeds but he wakes frequently at night, it sounds strange but it is like his feeding and sleeping aren't related, I feed him when he wakes but I'm not convinced he is hungry. He wakes 3 times a night and will only do a 3 hour stretch and only once, rest of the night is 2 hours or less. Very frustrating, hoping he will just start sleeping longer?