If you're looking for a DIY way to keep an eye on your baby, Element 14 has put together a guide that shows off how to build your own night vision camera with motion detection using a Raspberry Pi. The project here uses the Raspberry Pi 3 alongside the NoIR camera adaptor. From there, the Raspberry Pi runs a live video stream that can send you a notification any time it detects motion. It might seem a little stressful to use a DIY system for something as important as a baby monitor, but the live stream makes it so that you can check in as often as you like to make sure it's always working. Still, you might want to use it in addition to a more traditional audio monitor. Either way, head over to Element14 for the full guide to make it for yourself.
NoIR V2 Video Streaming Baby Monitor [Element14]