What is the main concern when using a humidifier in a newborn area?

Using a humidifier in a newborn area presents particular concerns regarding mold and bacteria. This is because when a humidifier adds moisture to the air, it can also provide a suitable environment for mold spores and bacteria to grow if the humidity levels are not carefully monitored. Newborns have underdeveloped immune systems, making them more susceptible to respiratory infections and other health issues arising from mold exposure.

Proper maintenance of the humidifier, including regular cleaning and ensuring that it doesn't create excessive moisture in the room, is essential to prevent microbial growth. Maintaining the relative humidity between 30% and 50% is usually recommended for comfort and to minimize the risks associated with both dehydration and excessive moisture that could lead to health problems.

While the other options may present concerns in different contexts, they do not directly relate to the primary issue of health risks associated with excessive moisture in a newborn's environment.