True, but, that is not the issue. While both men and women are indeed needed for baby-making, the burden of child care falls disproportionately on women in our society. So, male founders with young children can reasonably expect their child to be cared for by their partner while they dedicate all of their time to YC. But, the same cannot be said of potential female founders. It is not sexist to recognize this unfortunate state of affairs and suggest that child care support be considered an issue particularly important to women.

Thus, since YC expects their founders to spend most of their waking hours working on their start-up, they need to provide adequate child care support, if they want to have women with children among their founders (at least, those who are not already extremely rich and can afford the outrageous child care rates in SF).