In many bilingual families, parents make a conscience effort to teach their babes both languages. If one parent is proficient in one language and the other in another, it is normal for each one to talk to their tot solely in that tongue.
I try to chat in Spanish with my babe, but I'm not as diligent as I'd like to be. Luckily, her nanny is teaching it to her every day. And, at this age, she is soaking words up like a sponge.
Just the other day we were on a walk and she looked up at me and said, "Mano!" A little puzzled, I thought to myself, "Mano?" Then it hit me, "Hand! That means hand in Spanish!" So I reached down and her tiny palm met mine and off we went.
Will your child be bilingual?