Essential fatty acid present in breast milk which is required for normal growth of child is:

DOCOSA HEXAENOIC ACID (DHA) Sources: Human milk, Fish liver oils, Algal oils Synthesized in the body from α Linolenic acid. Highest  concentration  of  DHA  found  in  retina,  cerebral  cortex, sperms. Functions: Needed for the development of fetal brain and retina DHA is supplied transplacentally and through breast milk. Clinical significance: Low DHA is associated with increased risk of Retinitis Pigmentosa.