Alright, these thoughts are sort of out there, but I'm voicing them. So, perhaps when they abducted Claire, they injected her because there would be a possibility of her not being able to carry the baby to term. Maybe her womb would have aged, if you will, in that time period.
Or something.
So, now I'm wondering how this relates to Sun's pregnancy. Will she be able to carry the baby full term without help while on the island? Is it possible that somehow the others had a hand in her pregnancy?
Or, were the X-rays just ploys to try and entice Juliet to going to "Portland?"