I think Kate probably put her up for adoption or something? Or maybe she gave him to her mom. So many possibilities. She seemed pretty upset about it though.

Oh or maybe she left the baby with Claire's mom.

My mom and dad and I were watching it last night and when Jack said "Where's Aaron?", my mom said, real serious, "Ohhh Jesus, she killed him too." Seriously, I think that she gave him to Claire's mom and explained everything to her. Do you know if they're gonna bring Claire back?

That's my theory that she gave up Aaron to Claire's mom or that maybe someone kidnapped him to motivate Kate to go back to the Island.

I think Claires Mum is too obvious i think he might have been given to Cassidy as she is the mother of sawyers baby and they have supposedly been in contact. Also Jack would not be able to find him!

I really don't think someone kidnapped him. Kate would be raising hell.

^Agreed. At first, I was worried that he would be left alone or something, but I've realized that Kate would most likely gave him to someone whom she trusts.

However, I'm wondering if he will ever have to return to the island like everyone else?

I really have no clue what happened to Aaron, but Kate seemed pretty upset about it. Maybe she did give him to Cassidy so Jack wouldn't find him. But still, she seemed very distraught, like something bad had happened.

Now, if they have to "recreate" the crash as best they can, remember that Aaron wasn't really there originally, he hadn't been born yet. Do you think there's another pregnant woman on the plane?

^Some people are speculating that Kate is now pregnant with Jack's baby.

^What people?

^Fans on various websites. I've read the "Kate is pregnant" theories on a couple of websites over the last day or so.

I don't think Kate would've given Aaron up for adoption, or he was kidnapped. I thought that Aaron was one of the O6 and had to go back? (although Mrs. Hawking wasn't really pushing that point to far, hmmm...). I think she gave him to someone else like Claire or Claire's mom (too obvious) but I honestly have no idea where Kate would allow Aaron to go...