Why did the writer use 支 here？ I know it is not easy to say why which 量词 should be used when, but this one seems strange to me. Why did the author choose ‘支’？

开发出中国第一支儿童营养液，。。。

支 is normally for 'pens,guns, army divisions, songs and compositions.'

Maybe the liquid is in a bottle, which may be long and thin??
Since the container(bottle) of it is like a stick. We use 支 to describe all the stick-like things.

Maybe I should post a pic here to help you understand what I'm talking about: