I'm not a native English speaker so I was wondering the differences between small and little. When I was googling, I got the There is an important difference between the words “little” and “small.” The difference is, when describing an amount, we use “little.” But when describing the size of someone or something, we use “small.” Here is an example: The airplane seats are only a good fit for small adults.

But what about "little brother/sister" or "twinkle twinkle little star" or if it's someone's name such as "little Anna" or other nouns such as "little pig". If I'm understanding correct, the adjective I'm using for the example nouns are for the size. But I don't think you use "small" for it?