A one and a half year old baby does not eat well, may be caused by physiological factors, may be due to nutritional element deficiencies, stomatitis, etc., you can take general treatment, elemental supplementation, medication and so on. 1. Physiological factors: when the baby eats more milk, it will naturally lead to eat less; at the same time, it may be curious about the external environment, play time is more, so do not eat properly, you need to actively guide, eliminate the triggers. 2. Nutritional element deficiency: when the child is deficient in iron and zinc, it can lead to decreased appetite, abnormal development of taste buds, and the phenomenon of not eating properly. You can use the appropriate iron, zinc and other preparations to improve the symptoms. 3. stomatitis: decreased appetite, pain when swallowing, resulting in a one and a half year old baby does not eat well, you can use the open-throat sword spray symptomatic pain, while the appropriate oral supplementation of some vitamin B and vitamin C, repair of the oral mucosa. One and a half year old baby does not eat well may have other reasons, it is recommended to consult a doctor in time to find the cause, the cause of treatment. The above medication is in accordance with the doctor’s instructions.