Three-month-old babies with colds are mostly caused by viral infections. Mild colds can usually recover on their own with better care; if the symptoms are serious, you need to consult a doctor and follow the doctor’s instructions to choose the right medicine for the treatment of the symptoms. 1. Mild colds: Most colds are caused by viral infections, which are self-limiting. For a mild cold, for example, only a runny nose and sneezing, normal body temperature, normal mental state, feeding, urination and defecation, usually drink some warm water, pay attention to warmth, avoid being cold. Most of these colds will heal on their own with more observation. 2. Symptomatic treatment: If the baby cough, spit up, fever, poor mental state and other symptoms, need to consult a doctor in a timely manner, under the guidance of the doctor to choose the medication for symptomatic treatment, such as coughing phlegm is more, you can take aminobromine phlegm treatment, body temperature more than 38.5 degrees, you can take ibuprofen suspension and other antipyretic treatment. Three-month-old baby cold to general treatment, if necessary, under the guidance of a professional doctor to use medication, can not blindly give the child medication.