Your child and their immune system70% of the immune system is found in the digestive tract! This means the bacteria – both friendly and bad – in the gut can influence the immune system(1). When working properly, the immune system is designed to fight disease and keep bacteria and viruses at bay. Whilst exposure to bugs and germs in everyday lives can strengthen children’s immune system, if weakened at any time, our children become more venerable and susceptible to colds, flu and serious illnesses(2).