Child birth is a pretty normal event that the human female body is equipped for. Modern medicine also helps.
Perhaps some women are incapacitated by pregnancy, but world population numbers would suggest that most are not.
You might regard women who are pregnant as "beached whales" but most people would simply consider them as women who are going to have a baby.
The entire process of bringing a baby to term takes time. It gets the parents ready as well as the baby - after all, they will have to work together for the next...15 years at the very least?
Picking one up at Asda, while perhaps attractive to a certain type, will not work out well for the babies/children involved.