I think it could still be her English tutor that she had the affair with. I'm pretty confident it isn't Michael. Do you really think it's going to be some twist?

Based on the timeline it is definately Jin or someone on the Island, I pray Sun hasn't been unfaithful, it'd ruin her character for me.

Day 44 - Thursday, November 4, 2004 is the date the raft left.

A very likely time for 'relations' and Sun found out she was pregnant on Day 60, giving her at least 16 days (assuming she had her period at least 14 days before last time) to realise that no period, and starting to get worried.

Thus she wanted the pregnancy test.

Interesting..... watching a teaser the other day when sun said "... we would be burying another body" to Sawyer I thought that he was being revealed as daddy..... I'm preparing myself for some kind of uber shock.

Eww, Sawyer as the daddy, I'd say we can rule out everyone except Michael and Jin, and even Michael I'm horribly sceptical about.

You mean Jae Lee? And also, why did it not delay Claire's pregnancy?

The biggest question is, if it affects baby's on the island, why did it not affect Rousseau?

Didn't Ben say he was born on the island? How was that possible if no woman is able to give birth there?

Someone pointed out that Rousseau said she came to the island with Ben, but he said he's lived there all his life. But that's a whole other debate....

Rousseau came with her team, Ben wasn't on her team, Ben is related to Rousseau in no way aside from that he and the Others kidnapped Alex and he adopted her. They haven't been able to give birth as of late (IE: The last two decades or so), which I'm assuming is because of part of the purge :)

Rousseau was already several months pregnant by the time she got to the island.

Remember, Juliet said "it happens at conception," so that's why Claire and Rousseau didn't have any problems.

So if Jin is the father, then Sun's going to die unless they do something. But if she conceived off the island, then she'll be fine.

It is disgusting to imagine Michael the traitor as the father.

I predict that the pregnancy deaths are related to someone's backstory not yet being revealed. That person on the island would have an issue about pregnant woman dying, keeps on thinking about it, and somehow maybe due to the island's power, it just happens.

Just like Walt's comic polar bear, Locke's willpower to walk, Jack's painful loss of his father etc

I don't think your theory has that much to back it up davetay.

And summary for D.O.C (which stands for date of conception by the way)

After discovering that all of “The Others’” pregnant women died before giving birth on the island, an extremely reticent Sun allows Juliet to examine her -- and uncovers the identity of the unborn child’s father. Meanwhile, Desmond allows an unlikely nemesis to help save the life of a new, mysterious island inhabitant.

So we'll find out soon.

I hate the whole 'Island is alive' theory, everything can be explained with logic and reason, and I just don't find that reasonable.

I'm sure the father will be an islander... but maybe she has been impregnated artificially? Ethan strikes again.... could be revealed through flashback. That would open up a world of possibilities.... Ben even!

There is no way Michael is the father of Sun's baby. I think the odds that Sun cheated on Jin while he was away on the raft are very, very slim to none. Why would the writers do that? And there's no way she cheated on Jin while he was actually there on the island with her. Personally, I really don't see there being a huge twist to who the father of Sun's baby is... and all these crazy suggestions that guys like Michael and Sawyer might be the father are pretty rediculous. Just my two cents.

Heres mine...

I believe it to be.....

"Jin"

- I agree with Blackzack...I dont see anything major happening in the show with the whole 'DAD' of the baby...the birth on the other hand (or not) is the plot line...