Hi The answer is NO...
You have to start complimentary feeding from 6 months onwards. Milk is not the only essential nutrients. There are lot of other nutrients which have to be introduced one by one from 6 months onwards.
Important rules
1.liquid to semi-solid consistency
2.Start new items only in the morning
3.Gradually increase the feed day by day and make it a bowl by 3 days.
Next Steps
Please start ragi mixed with jaggery and your milk.
rice and dhal with ghee.
Apple , banana.
vegetables.
continue breastfeeding