G.M.
Hi E.,
I read this post and the previous one you mentioned. If you were my friend and we had this conversation over coffee and you told me what you have written in your posts, I would look you in the eye and say "E., you've got to find another pediatrician!" Your feelings are right on. This guy is giving you bad medical advice for your child, period.
Do some research on your own on reputable websites (Kellymom.com, LLLI.org, MassBFC.org, AskDrSears.com), and find a pediatrician who is better acquainted with current medical recommendations: a child should be fed EXCLUSIVELY on breastmilk (no water, no cereal, no nothing) until at least six months of age. You will know when your baby is ready for solid foods. He will try to grab what you are eating, he will make chewing motions when watching you eat, he will perhaps even choose his own time and item for his first food!
I found that my little guys never really ate any cereal. We had it around to add bulk to really watery fruits and veggies, but if you wait until they really are ready for food, they will want food and not mushy cardboard, and their little bodies will be ready, too.
We just treated food like a game until about one year. It was for experimenting and learning and exploring. Baby gets all the nutrients he needs from breastmilk until at least a year old, so don't drop any feedings until he leads you to do that (again, he'll let you know!). This really takes the pressure off, and mealtimes were just kind of fun at our house. No schedules, no worries about calories or ounces. All I kept track of was each item they ate on any given day, just in case of an allergy (unlikely in a breastfed baby).
As to your question about your dairy-free diet, I have no personal advice from experience, but I work with lactation consultants, and I seem to remember that you should give it more like three weeks to work. Again, ask a QUALIFIED doctor!
Believe it or not, eventually you will once again feel like you are not constantly nursing or pumping! Pretty soon your nursling will stretch the interval to four hours between, then four times a day, then three, etc. Just let him take it at his own pace and you can't go wrong.
Hope some of this helps. You're doing great! Asking the right questions, listening to your instinct...keep it up!