Deja, wow, compared to the struggles you have with you little boy and sleeping, I don't even know why I am complaining. My girl was the same as yours and I think perhaps that's why I am having such a hard time with my boy not sleeping! I also have to change his clothes as he gets so wet, no nappy can hold it all!
My pead said its very normal for little boys to drink often, and I must let him because he obviously needs it. She did give me a very good tip that has definitely been helping, and that is putting a teaspoon of rice cereal in his night time bottle before he goes down. She also advised not to change him at night unless me made a nr2, but that's not always possible for me. As long as I change him before I feed him he goes back down easily, only problem is then he screams and wakes the whole house up!
Zee, I recon 9pm to 4am constitutes sleeping through. You are getting a good 6-7 hrs sleep and that's brilliant! I envy you! Specially that she goes right back down after the 4am drink. At 15 weeks, my boy was waking up every 30 to 45 minutes after his 2/3am feed! It used to drive me nuts!
Marijke you've got two girls and they're so different with their sleeping. Again, that just tells me that its got so much to do with each babies different personality and needs.