Drinking from straw cup

I bought the straw cup quite a while ago and little Andrew doesn't know how to suck it yet. I tried giving it to him repetitively but he just doesn't get it. So I stopped giving it to him.

Last week I decided to give it a try and this time I pour some of his favourite apple juice. To my surprise he can drink from the straw cup! First few times he would suck it all in and choke. After a few more days of getting the hang of it, little Andrew can now drink like an expert!