CIO I trialled with my firsts baby after we couldn’t get out of the ‘rocking to sleep’ phase.
It had a massive negative impact, I regret it every single day of my life. She would be hyperventilating and throwing up from screaming and crying after only 1-2 minutes, then it turned into such a massive chore at bedtime, she would be terrified to go to bed, she would start hysterically crying if I even looked at the door or if she thought I was going to. It was awful, we could have never, ever have made it last 5 minutes of crying.
In my opinion, after my experience CIO is just teaching your baby that the one person they live and trust most won’t come when they’re upset and need comforting - and that why they stop crying, because they know no one will come.
My 10 month old son is just going through a slightly clingy stage and doesn’t like to just go to sleep by himself anymore, so I comfort him, put him down, stay a minute or two and then walk out of the room and come back in after a few seconds, to teach him although he can’t see me, I am always there. I repeat this and gradually leave it slightly longer and longer until he’s probably bored of watching me walk in and out and goes to sleep 😂
please don’t use CIO, babys cry because that’s how they communicate; it’s tough.. but there are much better ways of getting them to sleep better than having to listen to them cry for you until they’re exhausted.