Maybe the NYT is a bit short on their math prowess. Bristol is supposedly 5 months pregnant—the baby is not much, if any, more than 5 months old. I think it would be a bit hard to have babies that close together.
I think if a self proclaimed redneck hockey player got my daughter pregnant he would not have an oportunity to repeat the offense for a while.
Maybe ond of the babies is a space alien. According to people on Coast-to-Coast that has happened a lot.