Quebec has all sorts of bonuses, tax deductions, monthly payouts per child, and Canada (the federal level) kicks in incentives as well. Quebec provides extremely low cost day care too.
Nothing makes a difference. It isn't money.
I often see couples with 2 new cars, $1000 smart phones, 70" TVs, saying it's money. While clearly everyone isn't well enough off for this, if money was the issue, why are well off people not having 4 kids? Or even 3, often?
In Vancouver, I have only a couple of friend with kids. One has a FAANG management job after years of IC. The other is a single mother who works odd jobs and has kids in their teens now (one might be 20 actually). She receives alimony and government benefits, and allowed her to keep them fed and even take them on vacation once a year, but only because she locked in a rental unit 20 years ago and never moved or got evicted, and has some untaxed money coming in from selling art, the benefits, and she never eats out (only cooks and shops on budget). And she has shared custody with the father of one who does have some kind of job.
This isn't possible for people who don't have that stable place to live, and even then she doesn't have the freedom that my parents did to take them to things that cost money