What does CIO stand for?

Cry it out

Often found in parenting discussion spaces, CIO is an acronym that means “cry it out”. It’s used to describe a method of baby sleep training.

In this technique, babies are allowed to cry until they fall asleep on their own. It’s a method that sparks debates among parents.

Some parents feel that letting a baby CIO is neglectful, while others see it as an effective way to teach babies to self-soothe and sleep independently.

Example for using ‘CIO’ in a conversation

Hey! How’s the baby doing?

Hey! She’s doing okay, but we’re having some trouble with her sleep.

Oh no, what’s going on?

We’ve been trying the CIO method, but it’s been really tough.