Has anyone started introducing solids yet?

Ra
My baby is 17 weeks old but I feel he's needing more than just milk now. We've been giving him a tablespoon of babyrice before bed which is helping. I would have liked to wait until 6 months but I am going to try and wait until 5 months before I start introducing fruit & veg. He is around 16lbs so milk is not sustaining him. 
How many weeks did you start to introduce solids?