Do you have an old smartphone with no use? Turn it into a camera that could monitor your baby or child, within your internal wifi network.
This app does not require any internet access (other than for displaying adds) and no SIM card is required.
Just connect it to your internal WiFi network, and you can access the camera with any device that supports a browser (phone, laptop, smart TV).
This app allows you to play different sounds for your baby, use flashlight and monitor his movement during the day.