Baby clod catcher.  Called diaper in America.

National Disability Insurance Scheme.  An Australian scheme which is supposed to provide funding for disabled people but is infamous for funding people who prey on them.

A good act.  Well done.  Thank you or congratulations.

No problem at all.  You are welcome.

Yes.  Agreeing with the speaker but acknowledging a negative point first.

Zero.  Sometimes Americans say naught or aught.

Silly person.

Informal no.  Americans might say nope.

Figure out, think through.  Using the nut on the top of the body.