I haven't really fully thought it out. But you could maybe use the microphone to detect crying (if the baby is conscious). There is an internal camera that migh

I haven't really fully thought it out. But you could maybe use the microphone to detect crying (if the baby is conscious). There is an internal camera that might help as well to detect movement but may be a bit more difficult with rear facing car seats. I wonder if the weight sensor that triggers the seat belt warnings is sensitive enough to detect a baseline weight of the car seat and the weight of a child.