What are your sources for the rule you have quoted?

Normally in urban areas Council is responsible for noise control. Normally daytime noise is more acceptable that night time noise (numbers of people at home, background noise, noise travels more widely at night etc.), Noise for 1 hours is more acceptable than noise going many hours, esp. hours during sleep times.

I would be inclined to believe your source and say Yes they are not breaking any rules. I guess next questions - are they in the same building or another building? How thin are the walls? Do they rent from the same landlord? I don't think an appeal to council will help you but there may be other options.

Have you spoken with the neighbours, a polite approach asking them to please keep the music down a little because it is frightening your child, or similar may work, especially if you approach them in a courteous way and ask if there is anything you do that disturbs them, with a view of changing your behaviour also.

Are your owners tenants? If so there is nothing to stop you complaining to the landlords. Most rental agreements have a clause about not disturbing the neighbours or something similar.

Note that the rule you quoted specifies the times that the neighbour must keep the noise down, but it goes on to say the other things you can do for unreasonable noise at all times, if the above approach does not work you have these other options available to you.

That's tough Greg. When you are stuck with an unreasonable neighbour there is not a lot you can do about it if he isn't actually breaking the law.

I wonder if you have considered what else you can do avoid your child being subjected to the noise and bad language?

If it was me I'd be looking at options such as going out down the park when this noise starts, having some child friendly DVDs available to put on to drown out the noise and entertain the child. Perhaps you can find something that will work and suit your situation.

Sorry I was not able to help.