Breastfeeding is the feeding of an infant or young child with milk from a woman's breasts. Babies have a sucking reflex that enables them to suck and swallow milk. Human breast milk is the best source of nourishment for human infants.However, experts disagree about how long to breastfeed to gain the greatest benefit, and how much more risk is involved in using artificial formulas. A mother may breastfeed her infant, while there are conflicting studies about the relative value of artificial feeding, including infant formula, it is acknowledged to be inferior to breastfeeding for both full term and premature infants. In many countries, including the First World, artificial feeding is associated with more deaths from diarrhoea in infants. National governments and international organisations promote breastfeeding as the best method of feeding infants in their first two years and beyond. The World Health Organisation (WHO) and the American Academy of Paediatrics (AAP) also promote breastfeeding.Regulating authorities recognise the superiority of breastfeeding but also try to make artificial feeding safer.