Nutrition Deficiency in Children: Key Signs Every Parent Should Know Slower-than-expected growth in height and weight can indicate a lack of essential nutrients. Constant tiredness and low energy levels may suggest a deficiency in iron, vitamin B12, or other nutrients. A weak immune system and frequent infections might indicate a lack of vitamins like C, D, or zinc. Pale or dull skin, especially around the eyes, could be a sign of iron deficiency or anemia. Slow progress in cognitive development might indicate deficiency in vitamins like D or essential fatty acids. Brittle, thinning, or falling hair can be linked to a lack of protein, iron, or biotin. Cavities or delayed tooth eruptions indicate deficiencies in calcium, vitamin D, or phosphorus. Persistent dry skin, eczema, or rashes may be signs of deficiencies in fatty acids, vitamin A, or zinc. A sudden increase or decrease in appetite could be linked to nutrient imbalances or deficiencies like iron or zinc. Irritability, mood swings, or hyperactivity could be linked to deficiencies in omega-3 fatty acids, magnesium, or other micronutrients. Spot the signs and ensure your child gets the nutrients they need for healthy growth.