It will be interesting to see the effects of the new child benefit program coming this year. On the liberal website you can calculate the benefits families will receive based on income. With all the refugees coming with large amounts of children it will up the cost of that program as well.
For example a family with one working parent earning $25000 can get another $40000 (tax free) if they have 7 children. That would be a $65000 income after taxes. It will be predicted we will have a higher birth rate among low income people.