I gotta go with BritBrit's Sean and Jayden although Jayden is kinda cuter than sean and he resembles her mom so much. Plus It was really difficult to find a good pic of Max in google...
I would say the three kids are cute Max has Christina's eyes which are beautiful and then Jayden and Sean have the rest of the face more cute but the eyes are nothing special. I'm sure a combination of both would be the most cutest baby in the world.