The case history cited illustrates the diverse problems related to deficiency of folic acid. Even though this deficiency is unusual, it may occur when unsupplemented goat milk is used for infant feeding. Folic acid deficiency severely hinders cell replication and hemoglobin production. The clinical picture demonstrates the variety of pathological findings related to folic acid deficiency. The remarkable improvement in the infant following administration of folic acid illustrates the crucial role of a single nutrient in the promotion of growth, maintenance, and repair.