Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
Infancy is regular. It follows the -ies Conversion rule.
Use plural verbs: "The infancies are ready" (not "is ready").
Yes. The plural infancies is standard across all English variants.
The word infancy follows the standard English pluralization rule. When forming the plural, infancy becomes infancies. This follows the -ies Conversion pattern, which is one of the most common plural rules in English.
Understanding why infancy becomes infancies helps with spelling and pronunciation. Nouns ending in a consonant followed by -y change the -y to -ies in the plural form.
When using infancies in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The infancies are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.