there are so many people telling me there babies have a feed at 10-11 and sleeping through til 3-4am???
Well, not all babies are the same!! It's still perfectly normal for some to wake every 3hrs for quite awhile, especially when they're so little. My DS2 woke every 3hrs for months, and it took even longer for him to sleep at least one 4hr stretch. I guess the way I always thought about it was, if it had been 3hrs or more I would feed him. 3hrs or less and then he wouldn't be really hungry and feeding would cause a habit. Then once he was able to go 4hrs during the day, I expected him to be able to go 4hrs or longer at night but not feed if it had been less. Once we got a few things sorted and he was old enough that I knew he could go longer, I started stretching his night feeds further. But for us it took a long time to get there, I was still feeding him every 4hrs up until recently and he is 7mos! Now he is going longer at night.
Really though, very tiny babies have tiny stomachs and some will need to eat that often even at night. I know it's hard with other children, I have a 2yo as well. As she gets bigger you can expect her to go longer stretches.