Thanks for your query,
It is very good that you have done exclusive breast feeding till now.
Complementary feeding is to be started after 6 months of age,so i suggest you to continue with your feeding till then
You should take plenty of fluids,fruit juices,milk,nuts and good nutritious diet so that milk production increases.
Early introduction of semisolids lead to colic
and other problems .
Wishing your baby good health.