What's the plural form of starbirth? Here's the word you're looking for.
Answer
The noun starbirth can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be starbirth.
However, in more specific contexts, the plural form can also be starbirths e.g. in reference to various types of starbirths
or a collection of starbirths.
Examples
Starbirth regions exist in most galaxies, particularly in spirals, and are obvious as clouds of predominantly hydrogen gas call H II regions.