My best guess with the birthing issue is that we are seeing the Dharma initiative before they figured out much of the time travel stuff, so the island, at this point in time, is moving through time normally, which means fetuses develop normally. However, when the Dharma initiative figures out and starts messing with the time travel track that the island is on, one of the consequences is that fetuses can’t handle it, can’t develop normally and die, killing their mothers, too.

Or, how’s this for far fetched: the Dharma initiative realizes Ben and the hostiles are going to kill them all and there is nothing they can do about it, so they leave some sort of poison within their neighborhood that affects all of the women and sabotages their abilities to have babies. So, although Ben killed everyone involved with the Dharma initiative, they really got the last word because they, in essence, are causing the hostiles to become “extinct” through their inability to procreate…!

Here is another question: Why didn’t we see (or did we and I am forgetting) Faraday in the 3-year flash forward? Did he go crazy after the death of Charlotte and run off, or are they just waiting to show us his role later on?