प्रफेसार देथथ्वैलरा सुबुं देहा बिगियान देथा निफ्राय साननानाययो दि , आहार एंगारनायनि गुबै बैसोआ 4 आरो 6 बैसोनि गेजेराव ।
Professor Dettwyler estimates from anthropological data that the natural age for weaning is between 4 and 6 years .