Hi Usha Rani,
Thank you for your query,
Breast milk will be sufficient exclusively for the baby till 6 months and from there onwards in addition to breast milk, complementary feeds to be started.
You can continue breast feeding till the age of 2 years.
Don't introduce cow's milk as it will lead to indigestion
, cow milk protein allergy
So start complimentary feeding in addition to your breastmilk and it will be sufficient for your child.
Hope I have answered your query.