I know I may sound judgmental but after reading this article I wondered how truthful is that economy played the biggest factor in giving up their baby for adoption, it almost sounded to me like the perfect excuse. We are talking about the USA here, no Nigeria or Uganda. The US have several programs to help the less fortunate specially in situations like this one.
For me, their boyfriends/husbands are the real reason they did not keep their babies. Most of the time, men do not want many children specially if other kids are older and passed the "nursery" age.