The fourth declension includes neuter nouns with -а(-я) endings, which after declension achieve ен-, -ат-, -ят- suffixes.

Similar to the third declension it does not have groups (still the first and second declensions have them).

Neuter nouns with -а(-я) endings that mostly mean little animals or names of undersized things get the -ат-,-ят- suffixes: курча (a chicken) — курчати, кошеня (a kitten) — кошеняти, ягня (a lamb) — ягняти, немовля (a newborn baby) — немовляти etc.

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