What's up with the sleeping pattern

I wonder when will the day of Little Andrew sleeping through the night ever come? He used to wake up every 3 hours for feed but lately I had to feed him every 2 hours. I have increased him milk intake from 60ml to about 80ml now and yet he still needs to be fed every 2 hours.

In fact last night (2nd time so far), Andrew would not go to sleep at all after his 3.30am feed. He was sleeping in my arms after the feed but woke up and started crying the moment I put him back to his crib. It was like that the whole night until the next feed. I hope he will be back to his angelic self tonight.