Multiply that kids times five, subtract ten to fifteen g's from you annual income (this is for food, appropriate housing, clothing, toys, games, daycare, doctors, dentists, schooling, camps, sports) Subtract you mommy doing the laundry and dishes for you, and multiply the amount of laundry and dishes that you do by seven.
Welcome to my world.
Use condoms. (Actually, my first son, was a condom baby...lol....)
There, now does it belong in life sucks?