Breastfeeding is the best source of infant nutrition. Good maternal nutrition is important for the preparation and maintenance of breastfeeding.

When infant formula is to be used, a mother should be aware of the financial and social implications of formula feeding, the difficulty of reversing the decision of not to breastfeed, and the care that must be taken to prevent partial formula feeding from interfering with lactation.

Proper preparation of powder or concentrated liquid infant formula also requires the use of boiled water to mix with the formula and clean implements as well as careful adherence to mixing instructions.
Improper mixing or preparation may make the baby sick. Your doctor should be consulted before initiating formula feeding.