Wow some of you are some unreasonable witches here...
The OP didn't go and complain, she's really well aware a crying baby isn't something with a volume control that can be turned down, but you lot all think she should remain totally silent, to facilitate the every whim of this tiny screaming creature that isn't hers and benefits her in no way at all.. She didn't wake this child up, unless it was screaming the place down whilst also being asleep which is bloody unlikely!
Fuck that - stick your music on if you want OP, at a reasonable level, between the hours of 8am and 11pm and next time they come knocking, TELL THEM just how loud their PFB is!
My neighbours kids are SO fucking loud at the moment, the girl thing screams constantly, when having fun, when having some sort of crisis (got wet, got sand on it, fell over, saw a wasp, dog didn't let her torture it, got told off for hitting baby brother, daddy, mummy, was prevented from hitting baby brother/daddy/mummy)... when she isn't screaming her brother is, because shes torturing him, and then if thats not happening, mummy and daddy seem to need to TALK TO HER IN A VERY LOUD VOICE ALL THE TIME AND WONDER WHY SHE SHOUTS AND HAS NO INDOOR VOICE AT ALL....
They are driving me fucking nuts, I won't go and complain, because for change to happen they'd need to dramatically change their parenting style and that ain't likely (and nor will advice to do so coming from me go down like anything other than a lead balloon)...
However I WILL listen to music when I want... oh is it nap time, tough shit... and I will do my work which involves hammering metal sometimes.. and I will play with the dogs which involves barking... and should anyone be round to complain they will be told exactly where to stick it!
It really does go both ways, if you make noise, expect to hear noise!