Breastmilk/formula should be the PRIMARY source of calories for babies until age 1 year. Solid foods up to that point should just compliment the milk, not substitute. They NEED the fat provided in the breastmilk/formula for proper brain development. The solid foods don't have the proper balance of nutrition for their development.
As another mom noted, solids before 12 months are just for practice. Get them used to tastes and textures. Also, don't be afraid to give him soft cooked vegetables cut into 'stick' shape. It introduces them to the REAL taste and texture of table food. Honestly, purees taste terrible in my opinion. The real thing is so much better and then when they DO eat more solids they already are familiar with the taste and texture.
Anyway, at least 24 ounces of milk per day is generally recommended. Also, give the bottle before giving solids. Offer the solids about 1 hour after the bottle. This will help ensure he gets the calories from the milk and doesn't fill up on the jar food.