My bb had similar situation as yours when he was 1.5month old. I would keep on feeding him 5oz. If he cried within 3hrs, I tried to feed him water. If after 3hrs, I would feed him with milk. Meanwhile, in order not to have too much nutrition and too 熱氣, I would use 5 oz water for 4oz milk powder.
Now, my bb normally drinks 5oz but he sometimes drinks 6-8oz. It would be OK as he sometimes sleep for 6-8 hrs. The meal after his sleep would normally need more.
In fact , my baby started to介夜奶 because that day she was very tired! I found that if she was busy in the daytime and can't sleep well, she can sleep well at night.
Pinocchio ,
Your baby is very cute!
cscli,
don't worry! He has his time. Make him busy at the day time and don't let him sleep well at day time !
Normally, if my bb continues to cry after drinking milk, changing diapers, I will try "sweeping wind". If he stop crying, it means that he has "wind". I will sweep until hear the sound. You may check if your bb has "wind" if it is keep on crying.
Meanwhile, agree that if my son sleep less in daytime, he sleep better at nite.
As advised by my doctor, try to dim the light and don't play with bb at nite. The BB will sleep better. Hope you have a better sleep soon.