Learn how to say Breast-Feed correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word breastfeed:
verb (past and past participle breastfed)
(of a woman) feed (a baby) with milk from the breast:
she breastfed her first child
sometimes it is not possible to breastfeed
[no object] (of a baby) feed from the breast:
the child began to breastfeed