아이 means child,. 그럼 (그러면) has two meanings: 1. Right, yes. 2. In that case, then. So that sentence means something like: "A child then".

그럼 is used yes or then. And 아이 is a word meaning a child But 아이 is also one of reaction expressions. I guess 아이 그럼 can be #1) Of course! #2) oh! Then blah blah ~ Hope it does help you get the pictureee:)