1. Definition and symptoms of malnutrition in babies Malnutrition refers to a disease in which the human body lacks or fails to absorb the nutrients it needs, leading to physical dysfunction and growth and development retardation. Symptoms of malnutrition in babies include: slow growth in height and weight; dry and flaky skin; sparse and dry hair; prone to illness and poor immunity, etc. 2. Causes of malnutrition in babies 1. Unreasonable diet: