Thank you for posting this! I like how everyone is completely unfazed that Bats is playing with the little girl rather than asking the questions.
IIRC, there's another panel that can be interpreted as part of the theme Batman-and-kids later on - I think they're in graveyard, and everyone in the League is standing close to the grave, except for Batman, who's watching the scene from up a nearby tree.
I get the feeling that having parents present cramps his style with children.