Is it bad to use my phone while my baby sleeps on me?

There are two different questions

We asked whether it was reasonable to use a phone in her room, and separately how bad it was to be on it while she slept on us. Both times what we actually wanted was permission.

It helps to split it. Is this harmful to her? Mostly no.

What screen advice is really about

The screen-time guidance for babies concerns screens directed at her — content she watches, a device put in front of her to occupy her. The concern is about what it displaces: the back-and-forth of faces, voices and responses that's how she learns at this age.

A screen you are looking at in the same room is different. A phone while she sleeps on your chest is not replacing interaction with her. One thing that helped Papa was using dark mode with the brightness turned right down. A few minutes of television in the background is not something to panic about — and we asked that question ourselves after it happened.

The thing worth taking seriously is displacement over a whole day.

If large parts of the time you're with her are also time you're on a phone, what she loses isn't a measured dose of screen exposure — it's the interaction. She looks at you and you don't look back. That's the mechanism, and it's about your attention, not her retina.

Protect some phone-free attention

One practical exception: bright screens at night are worth avoiding because they can make settling harder for both of you. We found a soft red night-light worked best for us. We could see what we were doing without lighting the room enough to wake Ari fully.

So a dim room, no bright screen, and the phone face-down. That's about getting her back to sleep, not about her brain.