This is a very backwards and dangerous view of the situation.

You are making a speculation that your children will become a high-functioning adults that will be capable to produce more than they consume.

Overpopulation (as a real danger to our planet) aside, people who are opting out from having children are statistically highly educated and more successful (produce order of magnitude more than they consume) meaning that goal and career oriented individuals are feeding your children at this very moment altruistically (without any guarantees of payback from your children when they reach adulthood).