My girl baby is 6 months old. my breast milk is not sufficient to her presently .what might be the reasons for the decrease of milk. ?

Increased need: Your baby's needs have increased because he has more than doubled his birth weight by now. Though she still benefits from breast milk, she should have been introduced to a program of soft, semisolid and mashed foods by now. What foods those are is a matter of culture or as recommended by your pediatrician or American Academy of Pediatrics. http://www.uptodate.com/contents/starting-solid-foods-duri