S.D.
K.,
I know it is scary to see that much blood come from your baby. My daughter never had a nose bleed until she was 2 years old, but from that time (she is ten now) we have experienced some hum dingers! This is what I have learned.... The nosebleeds happen most when the air is dry. We tried humidifiers as well, but they don't help. When she has a cold the nosebleeds can be much worse and not seem to want to stop. Putting an ice pack on the back of her neck makes the nose bleed stop almost instantly. I know that at 18 mths, your son is going to fight you on this, but trust me, it works. If putting an ice pack on the neck doesn't stop the nosebleed then it is possible that he has some snot built up that is collecting the blood. I know that sounds so gross, but if you can get him to blow his nose and get that snot out, the ice pack will work. It took me so long to get my daughter to understand that blowing her nose would get that out, but now she can take care of the nosebleeds herself. Also, there is a medicine that a doctor prescribed called "Bactraban". You can swab the inside of the nose with it and it seems to keep the inside of the nose moist while killing any germs. Definitely keep a diary for your doctor and hopefully this helps.