at first i am giving my baby breast milk plus formula milk , but my dctor said focus on formula because may breast does not produce much milk , how can i produce more breast milk for my baby ?

Firstly, see another doctor who understands how breastfeeding works. This article may help you: https://kellymom.com/hot-topics/milkproduction/ Breastfeeding works on demand and supply. The more you latch baby the more you produce. Keep hydrated, try milk boosters (may or may not work). Pump every 3 hours. Use a haakaa pump to collect milk from the other side while latching baby