Hi YH,
I have exactly the same problem as you. My nearly 9 week old boy wakes up at these same times in the night. He goes to sleep at around 8 - 8.30, DF is fine, then seems to be up every night at the same times as your little one. I'm starting to think he is waking up to comfort feed. I'm often so tired in the night, I just feed him (sometimes I try to get him back to sleep without feeding), but it's really hard. Other times, I feed him, then I wake up and we have both been asleep, with him lying on me, which I know isn't a great habit to get into. I'm just so tired though!
This weekend, my husband is going to help me be strong, not feed him straight away when he wakes up, see if we can get him to sleep first and only feed him if it is really necessary. Wish us luck!