You’re missing the point. Daycare costs are extremely high. Why? Precisely because of what souprock says and you are actually agreeing with him. It’s not uncommon for it to cost the full pay of the mother for two kids, especially if they are infant/toddler as you say. But it is extremely uncommon for a family to have 4 kids toddler and under. Because kids grow up. So raising kids in a family instead of in a daycare is far more efficient, (ignoring for a moment all the other obvious benefits) and the cost is correspondingly lower.

Thus, balancing the budget in the context of having children often means skipping the absurd costs of daycare.