Not only did having their babies delivered in a US hosptial entitle them to stay here forever (probably on the dole), the mothers had no prenatal care and frequently would have complicated deliveries driving up the cost and the taxpayer's burden
We're actually losing good doctors on the border because of that. All OB's are forced to take call because with no prenatal care and high rate of infections and disease, these are high risk births. The illegals are very quick to sue if anything goes wrong. A doctor on call will spend most his night delivering these babies and then be too tired to take care of office and paying patients the next morning. And you're right about them sitting out in the parking lot until the baby is partly out and then they hobble in to get their US birth certificate.