There are a number of benefits of breastfeeding, many of which continue even after breastfeeding is discontinued. The benefits for the infant and mother increase as breastfeeding continues. However, even breastfeeding for a short period of time provides some protection.
For infants - Some of the benefits of breastfeeding for infants include the following:

  Better digestive tract function [...]

Immunizing individual children also helps to protect the health of our community, especially those people who are not immunized. People who are not immunized include those who are too young to be vaccinated (e.g., children less than a year old cannot receive the measles vaccine but can be infected by the measles virus), those [...]

It’s true that Newborn Babies are immune to many diseases because they have antibodies they got from their mothers. However, the duration of this immunity may last only a month to about a year. Further, young children do not have maternal immunity against some vaccine-preventable diseases, such as whooping cough.
If a child is not [...]