Many California children are raised in multi-language homes and others learn more than one language through school curriculum. Studies show that learning a second language is good for the brain and can reap personal and professional benefits later in life. It's like a form of mental exercise where no matter what language a person is speaking at the moment, both languages are active in the brain.
It's never too soon for a child to learn a second language. In fact, the earlier you introduce a second language, the easier it will be for your child to pick it up.