People saw that life after WWII was prospering and they were hopeful for a bright future. Therefore, they decided this would be a great time to start big families like they did before the war. The birth rate in Canada skyrocketed to almost as high as it was before the war in a matter of a couple years.
This is my grandma's family (present time). All the people standing are her siblings, including her who is standing third to the left, and the two who aren't standing at the top are her parents (my great-grandparents). She and her siblings are all Baby Boomers.
Were there any problems with the birth rate?
Yes. There was a shortage of teachers across Canada because there were so many kids enrolling in schools compared to during before and during the war, and the classrooms were getting too full. This meant there had to be more classrooms made, but there wasn't enough teachers to teach those new classrooms.