rest is the key: Hours of rest is the key relieving a cold. You may find your child need 10 hours of sleep each night, so don't need to set the alarm. Your child will be most comfortable in a humid and warm environment.

strepsils: strepsils will help you to ease the painful throat

honey: honey mixed with plain water or tea will oftenly helps as well. or it can be taken on its own

drink plenty of water: It's also vital to stay hydrated by drinking a lot of water. This will make mucus flow more easily and helps to ease the congestion

pain killer/paracetamol: paracetamol is used to reduce the body temperature and also acts as a pain killer. it also can be used in headaches, backache or colds

vitamin C: It is known that for the most part consuming vitamin C won’t help the average person prevent fever. However, eating vitamin C before the beginning of cold symptoms might shorten the duration of symptoms. Vitamin C can provide benefit for people at high risk of fever due to frequent exposure like people who is having a gathering with another group of people during cold or rainy season.