A 1-year-and-3-month-old child has tongue coating and defecates three times a day.

Tongue coating is more common in adults, but it can also occur in infants and young children. Under normal circumstances, tongue coating is usually caused by poor oral hygiene and the accumulation of bacteria and food residues. For a 1-year-and-3-month-old baby, if the tongue coating is not particularly thick and there are no accompanying symptoms such as fever, mouth ulcers, or decreased appetite, it may not be a matter for excessive concern. As for the baby having three bowel movements a day, if the stool consistency and color are normal and the baby shows no other signs of discomfort, this typically falls within the range of normal physiological variation for this age group.

To improve the baby's tongue coating condition, parents can try gently wiping the baby's tongue with a clean, damp gauze to help remove surface bacteria and residue. At the same time, maintain the baby's oral hygiene, regularly replace bottles and nipples, and ensure the cleanliness of feeding utensils.

Adjust the baby's diet by avoiding excessive intake of greasy and hard-to-digest foods, and increase consumption of light, easily digestible foods, such as steamed egg whites, lean meat, and millet porridge. Maintain regular eating habits for the baby, avoid overeating, and ensure proper warmth is provided to the abdomen.

However, if the baby develops symptoms such as diarrhea or fever, prompt medical attention should be sought.