To play the devil's advocate, there is an opportunity cost to your child learning a new language, which is he can't communicate and understand mildly complex th

To play the devil's advocate, there is an opportunity cost to your child learning a new language, which is he can't communicate and understand mildly complex things in preschool until he learns the language. During that time he could have read stories about things he never imagined, learned piano and understand music playing, learned to swim or discovered storytelling etc. My son is right now in the transition phase in a new language, and it's mildly sad to see him struggling with very basic concepts ("can I have these pencils? What is the teacher telling me? why is everyone moving their arms ?") when he otherwise would be learning what's the conductor's role is in an ensemble. Learning a second language lays the base for learning other things, as learning any of the above would also have oppened doors to to better understand other things. Time is finite and choices have to be made, not everyone might prioritize learning languages as much as other things.