babies and solids

I'm hoping for an answer as I am a bit confused. My pediatrician gave us some papers introducing a guideline for solids that follows: 2-4 table spoons of cereal per day, 2 tablespoons of veggies twice per day, 2 tablespoons of fruits twice per day. It also said to avoid combo dinners. So what would be combo dinners? We were trying to do meals 3 times a day for my son with his formula in between. How much formula are you giving your babies? Any advice will be welcome and we hope to get some response this time