And I needed a flexible job that allows you to work from home or be off as necessary to take care of sick kids.
They will make every vacation more expensive in terms of lodging, travel, food, and activities.
You'll be paying not just for gifts for them, but for their friends' birthdays, and holiday gifts for their teachers. You'll pay for admission to parks, memberships, and other activities you take them to to keep them busy and help them develop.
Even if they go to public school, you'll be paying for before and after care, extra classes, activities, equipment, lessons, tutoring, and so on. Their various support systems will ask for donations. You'll have to pay for babysitters until they reach the age where they can be unattended.
The total cost is tremendous and hard to estimate.
(I say this all as someone who thinks it is worth it and who 100% supports having children for people who are in stable relationships and who can afford it!)
My marginal housing, food, etc. costs is for them (guesstimating what I'd spend without them at 60% of my current expenditures), that's $700/month per kid * ~200 month = 140k per kid.
Maybe another $20k each in one off expenses like furniture, medical, birthdays?
A car for the last two years might run another $20k?
Day care definitely drives up the price.
But I guess being able to amortize over 4 kids makes it seem less daunting.