Hmm yes the last 40+ years of birthrates sure seem to coincide with economic factors.
https://www150.statcan.gc.ca/n1/pub/...014001-eng.htm
Face it, if you want replacement birthrates you have to make children financially viable. Since we live in a world where a very small percentage (less than 30%) of households have the old-school single-earner makeup, childcare is more necessary than ever. If costs remain the same, then these numbers need to be shored up with increased immigration.