It is not recommended to change formula when your child has a cold. A cold can lead to a low immune system and symptoms such as loss of appetite, anorexia, bloated stomach and upset stomach. Changing formula may aggravate these symptoms and cause a worsening of the cold. When you have a cold, you need to drink more water, take rest, take vitamin C supplements and prevent cross-infection. You can take pediatric aminophenanthramine granules orally, which can treat and relieve various symptoms caused by common cold, and influenza, such as fever, headache, nasal congestion, runny nose, sneezing and sore throat. You can also take oral Chinese medicines, such as Pu Di Lan Anti-inflammatory Oral Liquid, Blue Scutellaria Oral Liquid, Shuang Huang Lian Oral Liquid, Qing Kai Ling Granules, Ban Lan Gen Granules, Antelope Granules, etc., to clear heat and detoxify the toxins. When children have a cold, they can be treated by herbal tonics. For wind-cold colds, they can use Jing Fang Da Xie Tang with addition and subtraction, which has the effect of pungent warming and relieving symptoms. Wind-heat colds can be treated with Yin Qiao San plus or minus, which has the effect of pungent-cooling and relieving the symptoms.