# fifth-day fits

> English word · Noun

## Definitions
1. Benign idiopathic neonatal seizures, a rare form of seizures that manifests in newborns in the latter part of the first seven days of life.

## Etymology
Most cases of the syndrome have had their onset on the fifth day of life.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fifth-day-fits