Hello, I can feel that living in a condo will be having the worse experience.
Which part of Penang that you are living in a condo. You're not alone here.
Sometimes neighbor doing renovation. Can hear the noise like so loud.
Or even bird chirping outside even Windows are closed.

Sometimes during the night, can hear like dragging furniture, coins dropping and whatsoever.
Not only condo having this kind of experience. Even LANDED sometimes got one sounds.
Went to one house. The room inside can hear noises, must be the pipe running.
Only one of the room having the noise while other rooms are very quiet.

Sometimes even nearly so late until 12AM still can hear the noise and it is damn annoying.
Once you got one baby, you will have to experience more if your child has autism disorder.
Not every child will have. When children was little, more noise until they grow up then you won't feel emotional or distress with this. Like crying in the middle of the night affected your sleeps.

Maybe you can try to put soundproofing. Close doors if necessarily.
Put thicker doors and put soundproofing for the Windows.
If these solutions don't help you. I may suggest you to get soundproofing ear plug.
Like those using working in a loud place where sounds are too loud for them to work.

As for the autism child, if you already convince the mother and the child still making noise.
Don't blame the mother's as maybe the child kept doing the same thing everyday as the mother told the child not to do that. The mother is trying to stop him but the child still doing the same thing.
Imagine as a Teacher in Homeschooling.Told the students not to use Bad Words.
Until then, they ( Students ) refuse to listen the teacher. Every time the teacher kept telling them until the teacher don't bother already. It's like when you tell/scold someone not to do this and they refuse to listen to you and then you don't care about them already.

It is difficult to take care of autism child, sometimes during public, cry there and there non stop.
Worse thing is the child run so fast until you can't chase them. I have seen this kind of experience before.
Once you got baby and you will experience the same thing until when they reach older.
Sometimes not only autism child. Even normal children shouting and running around the corridor.
Or even adults talking so loud and laughing. Or sneezing or coughing. Or even people do party.
We can hear them sneezing from the kitchen area. Almost everyday I heard the same sneezing and coughing sound.