Respiratory disorders are the highest cause of mortality among infants. Technologies for health monitoring can help to avoid those underhanded events. In this paper, we propose a system for respiratory health monitoring. The system is non-invasive and the monitoring is performed in a contactless manner since it is based on Time-of-Flight sensors and post-processing. To validate the proposed system we proposed an experimental setup aiming to precisely emulate the breathing activity. The emulator is built around a step motor and a microcontroller, and it allows to seamlessly emulate breathing patterns. Preliminary results from the experimental campaign in a real-world scenario prove the effectiveness of the approach.