There's not much I can offer other than Matilda did that until she was 13 months and then once nightly until last week

Sometimes we offered her a bottle and sometimes we didn't. We found that giving her a bottle meant that she went back to sleep easier... which helped us. But then she would wake for it more so when we were rested up, we would start trying to just change her nappy & give her a sip of water to help get through the rest of the night.

One thing though with Matilda's wake ups, she tends to go through really bad phases a few weeks before major developmental changes, like crawling, walking, talking, etc etc Is he trying to do something?