Hi Sandhaya keep offering your breast often, you can give formula milk if you want. No cow milk till 1 year.

But my bm is very less... What to do..?

No.. please don't give anything until the baby is 6 months old.. exclusive Breastfeeding is recommended till 6 months. After that gradually you can start with liquids like juices , Dal Pani n rice water etc. Packet milk you can give after the baby is one year.