Child monitoring devices and systems

A child monitoring device comprising:

• at least one environmental sensor to output signals representative of an environmental condition in an indoor space in which the child monitoring device is located;
• a wireless communications unit;
• and
• a processing unit,
• wherein said processing unit is configured to:
• receive said signals from said at least one environmental sensor and process said signals to determine an indoor space air quality condition,
• cause said wireless communications unit to wirelessly communicate with an external database to receive data indicative of an outdoor air quality condition at a location at which said indoor space is located and data correlating air quality to child development,
• process said indoor air quality condition, outdoor air quality condition and data relating air quality of child development to determine whether said indoor air quality condition is within predetermined limits, and
• if said indoor air quality is not within said predetermined limits cause said wireless communications unit to output messages indicating adjustments to cause a change in said indoor space air quality condition to provide an indoor space air quality condition that is within said predetermined limits.