The word 'child' has an irregular plural form, which is 'children.' In English, most nouns become plural by adding -s or -es, but there are exceptions known as irregular nouns. Examples include 'man' (men), 'woman' (women), and 'mouse' (mice). Irregular plurals need to be memorized as they do not follow the usual patterns. Recognizing these exceptions is important for using the correct grammatical structures.
