I think if you look at the numbers, the poorer households and those with low incomes will be the ones with the most children.  This will be low income families and in Ontario and immigrant families.  The birth rate is extremely high for some cultures that don't believe in or practice birth control. I would guess that in most cases these families have stay at home care givers to begin with.
So again is all comes back to buying votes with the money of working Canadians. If you are going to do a childcare program, make it for all Canadians and not just certain groups. 

In the immediate future, my wife and I will be paying $2500 a month in daycare costs for 3 children.  That includes daycare and before/after school programs because we both work for a living in the private sector, you know, that sector the government loves to tax to death to pay for the people that don't work or sponge off the system.  Canadians are not having kids because they can not afford them anymore.