Question: what to do with infant runny nose?
Answer: Bulb suction. Runny noses can be treated by using gentle bulb suction or another suction device like the NoseFrida to clear the mucus from the baby's nostrils. ... 
Saline drops. ... 
Plenty of fluids. ... 
A cool mist humidifier. ... 
Petroleum jelly. ... 
Avoid decongestants and menthol rubs.