the blood could be from a little stress to the sinuses similar to when you get a cold and blow your nose too often. since your little ones are too young to use even honey as a cough suppressant a cool mist humidifier to keep their mucus thin is one of the things you can do to help them feel better. your pediatrician will have some other ideas.
my twins are 6 mnths have stuffy noses and a bad cough. one nose had blood in her mucus what should i do? . no fever cranky but will eat.