A formula is generally a fixed pattern that is used to achieve consistent results. It might be made up of words, numbers, or ideas that work together to define a procedure to be followed for the desired outcome.

Health experts agree that breastfeeding is the healthiest option for both mom and baby. They recommend that babies feed only on breast milk for the first 6 months, and then continue to have breast milk as a main part of their diet until they are at least 1 and better 2 years old.

A formula is a mathematical rule or relationship that uses letters to represent amounts which can be changed – these are called variables. For example, the formula to work out the area of a triangle. Triangle area = b h 2 (where represents the base of the triangle and represents the height of the triangle).

Commonly available infant formulas contain purified whey and casein from cow's milk as a protein source, a blend of vegetable oils as a source of fat, lactose as a source of carbohydrates, a mixture of vitamins and minerals, and other materials depending upon the manufacturer.