With 1 child they would be refused a benefit.  With 2 children they would get a small benefit.  With 3 or more children they would get a larger benefit.

4 children, 2 under the age of 6 and 2 aged 6+, with a family net income of $170,000, would receive $5,575/year in the Canada Child Benefit.  This could well be more than they would have received under the old Universal Child Care Benefit.

Also note that this is net family income, so potentially a family could be earning up around $225,000 gross income and reduce it down to $170,000 after pension contributions and RRSP deductions and still get that $5,575/year benefit.