During sleep, three times more growth hormone is produced by baby's body than when the baby is awake. Because during sleep the baby's brain growth reaches its peak, deep sleep is very important for the baby's growth. With the number of respondents 285 babies, data obtained 51.3% of babies have trouble sleeping, 42% of babies sleep less than 9 hours at night. This monitoring tool is used to monitor sleeping babies by utilizing Load Cell sensors to detect the presence of babies and sound sensors to detect baby cries, Node MCU ESP 8266 as the control center and the Blynk IoT platform as a user interface connected to the internet. The IoT-based baby sleep monitoring tool with the Node MCU ESP 8266 microcontroller has been completed and can work well to monitor the presence of babies and detect baby cries. Load Cell Sensors can calculate the weight of 0-20kg. When the detected weight is <2kg, the device will send a notification "BABY IS NOT IN PLACE" and when the detected weight is> 2kg then the device will send a notification "BABY'S SLEEPING". The sound sensor can detect sound sources with a distance of 0-50 cm. When the sound sources is 0-50 cm away, the tool will send a notification "BABY'S CRYING" and when the sound sources distance is > 50 cm, then the sound will not be detected and the device does not send any notification to the Blynk application.
Key word: Node MCU ESP 8266, Load Cell, Sound Sensor, Blynk