At home, speak in your native language only.

 I have seen a trend among Bangladeshi parents in Canada. They speak English at home to their children. The logic I heard from one parent was that this helps the child feel comfortable speaking outside, because in school they have to speak English.

This way, the new generation is not learning to speak Bangla. Even if they knew some Bangla from Bangladesh, they are now forgetting everything. If you notice, you will see that when Bangladeshi kids get together, they never speak in Bangla among themselves, only in English.

Your kid will learn English anyway. Even if you don't want to teach them. And if they learn from outside, they will speak with correct pronunciation, not with your native accent. It's actually the better way to teach them English.

My suggestion is that everyone should speak in their native language at home. No other language, ever. This way, kids will learn the language and will not forget their roots. Bangladeshi people died to keep this language alive. At least we should have some respect for that.

Some people write in Bangla on Facebook and think it's a very good way to show respect for their native language. I believe this will only give you comfort when communicating with people who speak the same language. That's it. Nothing wrong with it. But if you have friends and family from another country, they won't understand anything, neither will your kid or anyone else learn the language from your Facebook activity. People who speak other languages will feel left out of your posts.