Dear M.,
The needs of every child are so different, and it is important to listen to their signals. Starting cereal at 2 months is no problem, if that's what he needs, and he does well with it.
I started our son on cereal at about the same time. For him, breastmilk was like drinking water - no satisfaction. I supplemented with formula - still not good enough, and began adding flakes of cereal to the formula at about 5 weeks old. By 2 months, he was eating regular cereal. By 4 or 5 months old, I was introducing him to solid foods. The belief was to introduce one new food every week, which I had done with his older sister. Not so with Mark; he embraced every new taste sensation with gusto. My pediatrician supported my decisions every step of the way, against the popular ideas at the time to wait til 6 months.
Before Mark turned 1, he was eating whatever I served the rest of the family - even pork chops. Growing up, when other kids were ordering off the children's menu, he was ordering duck, filet mignon, and steamed clams.
Mark is now 23, a Lt. in the Army, and when he comes home, he still "eats us out of house and home", devouring every fruit, veggie, protein, and carb there is in the house. I'm just glad that I taught him proper eating habits. He is 6' tall and weighs 145 lbs. - and he is still my "eater".
Your son will be fine. Just listen.......Always.
W.