My son is growing up bilingual. It&#x27;s natural since mother and father have different first languages. I&#x27;ve been amazed since age 4 how easily he switches between the two languages. I&#x27;ll be talking to him in English and he will turn to his mother and repeat the whole conversation in his other language without missing a beat. He is also picking up Mandarin from watching videos on YouTube.<p>I have no way of knowing if his &quot;executive function&quot; (ok, I&#x27;ll go with that term) is better because of it. But learning to speak more than one language appears to be very easy for kids.