If you want a bi-lingual baby

So now you have to convince the parents to speak alternating languages in every other sentence.

Or just watch a TV channel other than their own language....

It is easy for babies to distinguish two languages. If the parents have different native tongues, such as French and English, one parent uses French and the other uses English.

My daughter is now picking up Vietnamese from her mother and English from me, although living in Vietnam her Vietnamese is way better than her English. She even says the same thing in two languages these days, at 24 months old, such as, "Hết rồi - All gone !". Or uses two languages mixed together, such as, "No, no, đưng có làm như vậy ! [No, no, don't do that !]

Learning two languages is not slowing her up at all. In fact she comes out with outrageously long sentences like, "Chú Thắng, bà ngoài ăn hết vú sưa của ba rồi". [Uncle Thang, grandmother has eaten all Dad's star fruit.]

I hope she will remember her Vietnamese when we return to Australia to live in a few years time.