Aaron and Vincent

[Raguoc]

Who do they really belong to? And what is the baby's real name?

[Hοelli]

One of kids playing Aaron (there were more than one) is Matthew David Viventi, that's all I know ;)

[Athalia]

Vincent is played by a dog named Maddison, who's most likely owned and trained by an animal film school.

[xxGoneforeverxx]

Matthew David Viventi is 17 months old (he was born is June 2nd 2005). He lives with his mum, Lisa and his dad about a half hour drive from the lost set in Oahu. Apparently (i had a close look at the baby in this episode and it does resemble him) the latest episode to date (reported) that he was in was "Live together, Die alone". But i think he was in the episode "Further Instructions" but the scene got cut before it was aired.

There is also a baby girl named Jade who plays/played Aaron. Her last name is unknown.

Originally there was apparently 2 sets of twin boys and three unrelated girls who played Aaron or something like that.

As for Vincent, as Athalia said, he is played by Madison. There is footage on the series 2 box set dvd of Maddison's owner and Maddison.

*Edit*

On E.T they did a set visit for season three. It showed the mums and their babies behind the scenes. Here are the screencaps (you can download the piece of footage or view the screencaps over at lost-media)... courtesy of lost-media.

http://i47.photobucket.com/albums/f184/Me4Charlie/Lost%20pictures/aaronbtsbabies3.jpg

http://i47.photobucket.com/albums/f184/Me4Charlie/Lost%20pictures/aaronbtsbabies2.jpg

http://i47.photobucket.com/albums/f184/Me4Charlie/Lost%20pictures/aaronbtsbabies.jpg