Hi.. how do u train ur baby to drink from straws?at what age to u train them?

I trained all my 3 children at around 6.5 months. Initially they will keep biting the straw. What I did was continue to offering the straw, and at the same time, try to suck from the straw to show them how it is done (exaggerated version). I tried a few brands of straw cup (pigeon, combi, avent) and found combi step 4 easiest to suck due to the slimmer and longer straw. It is also pricier compared to the rest. So maybe before you want to commit to a straw cup, you can let your LO practise with those disposable straws first (daiso sells a big pack of straws for $2). Find a thinner one and cut it into half.