Is There a Third Language?

Let your child learn english at a young age. They'll learn so fast, so easily. But the question is, what if already like and my my kids are going to be biling? So they're already learning two languages. Should i add a third one? And my ideais, yes, why not? But just do it in a more relaxed way, right?So japanese and english will be the main languages,. Cause that's what my wife speaks and i speak. We live in japan, so they're going to get those two at a very high level. I've decided to go ahead and just do a little bit of spanish with them. Just cartoons