Whether you're expecting a child, planning to have one soon or have just become a new parent, you're about to embark on one of the most rewarding journeys that life has to offer. It's also one of the most expensive: an average of $12,500 per year until age 18.1. That's $225,000 per child, and it doesn't include the cost of post-secondary education. Planning for this is one way to be the best parent you can be.