The Real Way Sun Was Impregnated
This will come as a total shock but I have discovered the only way Sun could have become pregnant - she slept with her husband.
If you don’t buy that theory then here are some others:
1. Sun cheated on her husband with either Baldy or someone on the island
If it was Baldy then she was pregnant for several months before realizing it. Possible but I doubt it. Baldy didn’t show any interest in her in the past and while I’m sure he found Sun attractive he had eyes for a girl he met at Havard. As for Sun being with anyone else on the island … nothing to support theory.
2. Doctor was wrong - she could always have babies
The opening scene sure made it seem like Sun and Jin were trying for a kid. Wonder why it didn’t happen. On top of that you have the issue with the doctor then having to make a mistake. While this is possible I don’t find it likely.
3. The Island got her pregnant
Something in the water … or over at the Fuselage someone posted about Dharma genetically modifying the fish that the Losties catch so that Sun could get pregnant. Wouldn’t bet on this theory being true.
Which leaves us with ….
Sun and Jin’s flashback being a fabrication. There is nothing wrong with Sun or Jin. By controlling their memories Sun and Jin now believe that there is a “miracle” on the island. Sound familiar? Remember Locke - from day 1 he was driven to understand the island because he really believed that he was paralyzed. Lands on the island and poof - his legs are working just fine.
So, while you are free to believe in immaculate conception I’m going with memory implants for my theory.
