I see it as a parasite. The baby does not give back to the mother other than furthering generations. Which is not entirely a good thing, seeing how the world is over populated in the first place.
The baby causes physical harm and damage, back problems, malnutrition, sciatica, organ damage, etc... Plus, the mother can die giving birth because of all the ripping and blood loss.
Even after birth, you have post parden depression, and it leeching further resources. Sever sleep loss, stress levels unheard of, and money and time being sucked from the parents. All this to hopefully seeing the child successful in life. Which is only up to the child, so 18+ years could have been for nothing and you wasted half your life to a lost cause.