We need to make it more common for people to have children first, then once the youngest is in school, only then, for the stay at home parent to get a part time

We need to make it more common for people to have children first, then once the youngest is in school, only then, for the stay at home parent to get a part time job (or possibly study at university part time), and when the kids are in their teens switch to a full time career. People are living longer, there's no reason you can't have a career second. But biology is such that kids need to be first. And no, kids aren't as expensive as people think. If you wait till you have lots of money you'll never have the kids to spend the money on.