What, you think babies just poof into existence? You think a couple cells get together and say "ok, now we just have to get bigger"? No. The woman's body sets up a "feeding" system to provide energy for the work HER body puts in to developing the fetus, which is largely directed by her hormonal and nutritional influence. Even the DNA to create the fetus would not exist in full if not for her.
There is nothing original about a fetus' development. It is all guided by the influence of the parents' DNA and the woman's body. It requires a builder, and a provider of tools.