9 months baby cold diarrhea should be as soon as possible to keep the baby warm, local hot compresses, supplement warm complementary food, timely replenishment of water and electrolytes, and in severe cases given medication. 9 months baby cold cold diarrhea, can take the following measures to solve the problem: 1. Keep the baby warm in time, add clothes in time, and cover the abdomen with a good blanket when sleeping. 2. Local hot compresses or drink hot water, hot compresses should not directly contact the skin to avoid burns. 3. Timely replenishment of water and electrolytes, you can give the baby to drink a little bit of light saline, so as to avoid low sodium and low potassium caused by fatigue, slow heart rhythm and other effects. 4. Normally, you can add more warm food, such as rice porridge. 5. If the baby’s diarrhea is serious, consult a doctor in time and give corresponding treatment, such as montelukast or take intestinal mucosal protective agent, such as aluminum sulfate. The above medication should be used under doctor’s guidance, avoid self-medication to avoid adverse effects.