Phone holders and babies

I don’t have a smart watch and don’t have any plans on getting one, so I’ve run into a real issue with my phone. My son is just 2 months. There are times when he doesn’t want to be put down, and I can’t really respond to texts on my phone. Either he’s moving around, and I drop it, or I just can’t get to it.
Does anyone know of a well designed wearable phone holder that can be worn on the forearm or easily attached to the arm of a chair so that I can take care of my baby and use my phone when I need to?