They are very adorable!
Where did you get them?
Just so you know, and a
lot of people don't know about this, they are probably actually Easter Eggers and not Ameraucana.
Easter Eggers are
usually bred from Ameraucana (and yours definitely are by the looks of them). You can tell if they are because they usually have a pea comb, and a beard, which yours do. Which means you could get blue or green eggs if they are girls.
But a lot of hatcheries, to make money, breed Easter Eggers, and label them "Americana", which is
not the same thing as "Ameraucana". Most places that sell them, such as feed stores, have no idea and just sell them like they are told.
Purebred Ameraucanas usually do not look like chipmunks when they are chicks, but Easter Eggers do. Easter Eggers, a lot of the time, are Ameraucana bred with a brown egg-layer such as Rhode Island Red. (though they can be bred a lot of different ways).
However, your babies are absolutely adorable, and I'm sure you will love them and get beautiful eggs.

We have Easter Eggers and they are some of the sweetest chickens we have who lay the prettiest eggs.