Hi
I honestly think its hunger, he feeds every 3 hours during the day. But, when he wakes for the first time (around 12-1)he will drink around 5oz so he's definitely hungry. The 4am feed he only takes a little bit and i think thats more a comfort thing so this one may be a habit as he then wakes for the day 2 hours later.
I thought he was abit early for water in the night, he has a little during the day sometimes as he's on gaviscon and can sometimes make him a little constipated. I would prefer to wake in the night if he needs the calories than give him water. Am just grateful he can now sleep for longish periods,
sarah
x