My twins cribs are in my room and I dont wanna turn the humidifier on if its not good for them.
the only way it wouldn't be good is if it gets TOO moist in there and mold grows. Mold is bad, humidity is good. Only run the humidifier at night and make sure you air it out during the day. Be especially careful if you have carpeted floors. If the humidifier sprays a lot of water into the air nearby that lands on the floor, put a towel down and make sure you remove the towel in the morning (to protect the carpet from getting wet and growing molds and fungus).
if they are vulnerable to have colds and stuffy noses and other stuff like that, i believe you can put it on. But, keep the humidifier away from them because too much moisture could hurt their lungs. Be sure to check with your doctor to make sure that it is alright. Good Luck!
Thanks both of you!