When a child catches a cold, it's important to consider their specific symptoms. If the cold lasts no more than three days and the child is in good spirits, you can treat them with anti-viral and heat-clearing Chinese patent medicines. Their diet should be light and easy to digest, and include plenty of fresh vegetables and fruits. If the baby is exclusively breastfed and under six months old, the mother should ensure a balanced diet, consume easily digestible foods, and avoid overly greasy or spicy foods.

If the child's cold persists for more than three days and symptoms like cough with phlegm appear, it's necessary to bring the child to the hospital for timely tests, such as a complete blood count and C-reactive protein, to rule out bacterial infections and provide appropriate treatment based on the child's condition.

For infants with a cold, considering their underdeveloped organ functions and weaker immunity, even a common cold can easily lead to secondary viral or bacterial infections, potentially causing severe diseases like pneumonia. Therefore, it's best to take the child to the pediatric outpatient clinic for assessment and targeted treatment.

If it’s inconvenient to visit a doctor, consider that most colds are caused by viruses, such as respiratory or enteroviruses. Therefore, you might treat the child at home with antiviral Chinese patent medicines and symptom-specific supportive treatments. It's also crucial to manage their diet well, as digestive functions can be compromised during a cold. Thus, meals should be small and frequent, and it's advisable to avoid hard-to-digest and potentially allergenic foods to prevent exacerbating symptoms.

(The use of medication should be under the guidance of a doctor.)