How do I prevent frequent cold and cough for my 4 year old child?

At 4 years, your child will be a huge magnet for cold and cough especially while going to school. Also, immunity levels are still developing at this age, so your child needs some extra precaution. Make sure your child washes hands with soap and water frequently, especially after coming back from school or playing. Covering the mouth while sneezing and not sharing food from someone's plate are also effective ways of preventing a cold or cough. Keep surfaces clean by regularly wiping them with an antibacterial solution to prevent the spread of germs. Hope all this helps :)