Islam has always vigourously promoted the natural practice of breast-feeding. It has now been discovered in the West even, that breast-feeding is not harmful to women.
"For decades, women who breast-fed their infants were urged to supplement their diet with calcium to protect against bone loss. A new study says they don't need to." – TIME, Sept 1, 97.
Furthermore, it has also been discovered that breast-milk alone is sufficient for all the needs of an infant: "Many mothers of infants don't know that it might be dangerous to give their babies water regularly in addition to breast milk or formulas. Young infants are unable to filter water properly through their systems." – TIME, Sept 1, 97.