After the baby vaccination a little runny nose, should be at home to observe or take medication to relieve the symptoms. 1. If the allergy is due to vaccination and the allergy symptoms are mild, just a little runny nose, you can first observe at home, drink more warm water, to promote the metabolism of the vaccine drugs, and ensure sufficient rest. 2. If the runny nose is caused by cold or cold air stimulation, you should keep the temperature and humidity of the baby’s environment appropriate, let the child drink plenty of warm water and pay attention to keep warm. At the same time, you can use a hot, wet towel on the baby’s nose, to help keep the baby’s nose open, to avoid snot blocking breathing. If the symptoms are serious, you need to actively go to the hospital and follow the doctor’s instructions for reasonable treatment.