I think Kate did have a baby before the crash. When she questioned Miles she wanted to know what he knew about her. I think she wanted to know if they knew about her son. Also the woman watching the son while she was gone had said how much he missed her. They made a point to say that. She wasnt in prison that long. Also the mother said Dr had only given her 4 years to live. Kate saw mother just before that. Baby looked about three. It always bring back to same question if you were wanted...

I think her son could either be Claires son or she might have had a son before the crash. Always wondered why she wanted off the island so bad if she was a fugitive. When she is talking to Claire this past week I noticed the way she was looking at her when she said about having a baby. Looked like she already had one to me. On the other hand why would Jack be hesitant to see him. Maybe guilt maybe something happened to Claire and her baby which is his lil sis and nephew. But if you remember...