So seeing we talk french and english to our son, he still doesn't really talk (yet understands both languages) Sure he says words left and right and we understand him... but when he starts having a deep conversation in gibberish .... I can't help but talk gibberish back.

The conversation can go on for 15 minutes... it's really funny!
I don't want to promote his not talking but at the same time... I know he won't be talking in sentences for a while.

Do you talk in gibberish?!