Both younger kids love thinking of themselves as Mommy's baby, and they vie for title to this position (even between themselves when they don't know I'm listening):
Lizzie (while in my arms): "Lizzie Mommy's baby?"
Me: "Yes, Lizzie bean, you are Mommy's baby."
Lizzie: "Yes!! Lizzie Mommy's baby. (pause) Seth no Mommy's baby....no no no. Lizzie Mommy's baby, no Seth Asrat."
(heard from another room, Seth's voice yelling at Lizzie): "NO Lizzie - Lizzie no Mommy's baby...Seth Mommy's baby! Enough!!"
With that, the competition begins again. I just laugh...glad that, now that Matthew has relinquished the title, someone still wants to be the baby in the family.