na-adjective, noun
A katakana word glossed as “little.” In ordinary description, 小さい is more normal; リトル is often used for a stylish, foreign, child-related, or name-like effect, especially in compounds and titles.
この店にはリトルサイズの子ども服もある。
This shop also has little-size children's clothes.
「リトル・マーメイド」は子どもにも人気がある。
The Little Mermaid is popular with children too.