What factor does NOT influence the nutritional value of breast milk?

The nutritional value of breast milk is influenced by various factors, but the geographical region itself does not directly alter its composition. Breast milk is primarily designed to meet the nutritional needs of an infant, and while it can vary based on certain aspects, it is largely consistent across different regions due to biological processes.

The mother's diet is crucial as it directly impacts the macronutrient and micronutrient profile of the milk. A well-balanced diet can enhance the nutritional quality of breast milk, ensuring that the infant receives essential nutrients. Similarly, the mother's hydration level can affect milk production and the concentration of certain nutrients. Additionally, the baby's age plays a role in how breast milk's composition changes over time to meet the growing infant’s developmental needs. However, geographical region encompasses a wide range of factors that do not change the fundamental biological mechanisms of breast milk production, making it an indirect influence rather than a direct factor.