Does it really worth it? I mean, introducing the baby to a new language, when that language is not regularly used at home.
Actually my sis had the same idea when she had her son few years ago. She said that the baby brain is like a sponge, and will absorb whatever he is in contact with. So she started speaking to her baby in Cantonese and Spanish. Her husband speaks really bad Cantonese, so he just spoke in English with the baby. She also placed the baby in a nursery, and the lady was from mainland China, so was kind of speaking to her son in Mandarin. ... Although my sister was swearing that the baby was able to understand a lot, he wasn't talking till he was like 2 year old (I know, some baby develops the verbal ability later than others)... And was basically a mix of every language he had contact with.
Now the kid is 3 year old. My parent went to visit them few months ago (in Vancouver) and ended up complaining that the kid doesn't speak Cantonese, but only English...