When we moved into our house our neighbors came over, introduced themselves and let us know their daughter was autistic and would, on occaison, be screaming

-- this worked well, since the first time I heard her scream, it sounded like someone was killing her -- had I not had the information, I would have probably called the police!! Since we've moved in, we've added one more little man to our house, so the yelling in my backyard equals the neighbors daughter refusing to do something

-- however, I've always made it clear to all my neighbors that if my kids were being too loud, please let me know. But, to me kids being kids (playing loudly) is something that you get in a neighborhood (just needs to stop at nighttime, no early morning, etc. and no screaming) If this child is loud to you, imagine what her parents hear!! I would make a nice social visit to the family (Maybe bring some cookies

) and try to work the noise level into a conversation, maybe you will learn something about the family that will explain it or at least get it across to them that the child is too loud.