After a baby catches a cold, symptoms such as vomiting milk can occur. Following a cold, the secretion of digestive enzymes decreases, which can lead to gastrointestinal symptoms including sudden nausea, vomiting, and diarrhea. When cold-induced vomiting is severe, it's important to feed the child a light, easily digestible diet and administer antiemetic medications, such as Vitamin B6, compound rennin, or aluminum phosphate gel, which can effectively stop the vomiting. Additionally, it is crucial to actively treat the cold, primarily through symptomatic treatment, increased fluid intake, and taking cold medicine.