Sounds like you are doing a really good job training and managing your dog! Keep it up! Things will likely settle down in a bit.
Training wise you might want to go just straight forward Counter conditioning since you're always outside with your dog. If unfamiliar, more or less just tossing some food each time you hear the kid. Generally what happens is automatic attention when the dog makes the connection that something tasty follows the noise. Later You can build on that attention once the association is established. Perhaps by asking for and rewarding incompatible behaviors.
Another nice option (similar but involves a marker such as a clicker) is the Listen to That game. It's a play on the look at that game and for auditory triggers. Sara Owings has a pretty nice tutorial on youtube.
Or if able (sounds like maybe you are) and your dog isn't completely loosing it, you could just interrupt and redirect the barking, though it tends not to eliminate all barking. That's the route I tend to go most of the time myself because I like my dogs to alert bark. They bark and I check it out. If it's no big deal (neighbors out, mailman, deer, etc.) I normally just thank them, ask them then follow me and then go do something different.
Posted via Mobile Device