Hi Noha
This is a really interesting topic
1. How do you prevent them from mixing the two languages together, as in saying for example spanish and english words in the same sentence? What if you want them to speak both fluently but separately?
I have some experience of this - I babysat some bilingual kids in Israel and it was fascinating to observe their speech habits.
What I actually found was that the kids mixed English and Hebrew together seamlessly. This one little girl was crying and kept repeating, "I want my buck book!" I was going, "What book is that?" It turned out "buck book" was the Hebrew word for bottle!
I would tell the kids that they had to speak English to me because I didn't know Hebrew, but they would inadvertently slip in some Hebrew words. I don't know the exact age of the "buck book" girl, but I would say about three or four.
Meanwhile, my husband's daughter grew up bilingual in English and Cantonese, and at the age of two, made up "Christmas Aabaak" ("aabaak" meaning "uncle" in Cantonese) to mean Father Christmas or Santa Claus.
What I know for sure is:
- Children *will* mix the two languages - and it's adorable and completely harmless for them to do so! They won't know the difference between the two languages when they're very small, but at a certain age they will figure it out.
- You absolutely do not have to worry about your child mixing up the two languages when (s)he is older.
If you and your spouse have different native languages, then this is a golden opportunity. By each speaking your native language, you are giving your child the greatest linguistic gift possible. Otherwise, if one of you is merely fluent in another language, then it's fine to use it sometimes - but you should preferably speak in the language that comes most naturally, most of the time.
2. When is a good time to start teaching a third language? Schools usually start at Grade 1 here (around 6 years old)...is that the optimum? How much time generally should you leave between each new language?
It is never too early to start teaching a third language. Six is a very good age to start (and young enough for the child to be able to speak without an accent). You do not need to leave a set amount of time between languages. Children really are geniuses in this regard!
Best of luck Noha, and I hope you will share some cute Spanglish phrases of your child's in due course :-*
Maddy