Disclaimer:I don't own Batman.
Truce, and the Mistakenly Familiar Batman
Truce age: 2
When Truce was 2, she started to cry. Alfred could not calm her down, so he had asked Bruce to do something to keep her from crying. Bruce went to the batcave, put on his suit, came back up, and then talked to Truce. Truce had stopped crying, and started to giggle. Then, Batman picked her up, and she hugged him. She had never cried after that.