The best humidifier for a baby is the same one that’s best for adults—it just needs to be cleaned more often. Beyond that, a humidifier in the baby’s room should run all night without over-humidifying or needing a 4 a.m. tank refill. The model that meets those needs is the same one we picked in our guide to the best humidifier: the Honeywell HCM-350 Germ-Free Cool Mist Humidifier. It doesn’t have the cartoonish cuteness of some other humidifiers marketed for children’s rooms (which is arguably not exactly a flaw). More seriously, this model is distinguished more than anything else by how much easier it is to clean and maintain than nearly every competitor out there, and we can’t overstate how much cleaning and maintenance are required to operate a humidifier in a baby’s room in the healthiest possible way.