Mateo has never had a favorite toy. Diego has a bear that has been his best friend since he was two weeks old. Mateo, on the other hand, is just as happy carrying around any toy that happens to be in the same room.
One of Mateo's favorite books is "Lily, la ruidosa" about a hippo that makes too much noise. Ever since we read the book, every time he sees a hippo he smiles and yells "Oh, Lily!"
I wanted Diego to have a gift to give to Mateo for his birthday. While we were at the zoo one day I asked Diego to pick out a stuffed hippo for his little brother. When Mateo pulled it out of the gift bag he exclaimed happily "Oh, Lily." He now has to sleep with his hippo every night. I have a feeling that it has something to do with the fact that his big brother gave it to him.