i had to look up neocate. :( poor kid! you know, infants can be allergic to rice cereal. i know a friend of mine whos infant, from the day he was born, could not have rice, corn and various other foods. mom breastfed, and cut those things from her diet. it is possible, but its hard. breastmilk helps "cure" intestinal trouble, but formula can help as well, especially a kind that is made for infants with allergies (at least one can hope!) but one thing i know for sure is that if an infant is under 4-6 months old, solids are NEVER supposed to be recommended, for an infant with allergies, i cant imagine ever giving solids before 6 months.
for infants in general, the american academy of pediatrics recommends NO SOLIDS of any kind until signs of readiness are shown (sitting on their own, not spitting out, whatever check www.askdrsears.com for the "list" of readiness cues) which usually occur between 4-6 months. for infants with a risk of allergies, its usually recommended that you wait as long as possible toward the 6 month mark. for infants WITH allergies already diagnosed, you should probably not even think about solids of any kind until 6 months. i mean, do what feels right, but i would honestly be more worried about your infant and his digestive system being protected and finish developing, than making sure hes getting solids for any reason. just a side note, it will NOT make him feel full longer and it will NOT help him sleep longer. infants wake often to eat because their stomachs are only the size of their fist; they fill quickly and they empty quickly. this first year your son will double his height and triple his weight. hopefully this is the only time in his life that his growth will be to that magnitude. think about it for yourself, hypothetically, if you had to double your height and triple your weight, how often and how much would you have to eat? its huge. dont neglect this important knowledge. he needs to eat often. you dont become a parent to sleep well! we all sympathize with you.
just for comparison, the world health organization recommends EXCLUSIVE breastfeeding until 6 months of age, formula feeding should be treated the same; exclusive liquid until 6 months. my son with NO allergies was 5 1/2 months when he was literally ripping the spoons out of our hands, and was adequately ready. this comment on the w.h.o. can be found on the neocate's own website, though im sure the world health organization has its own website you could look at as well.
if your doctor suggested the cereal, i would highly recommend getting a second opinion. i have a hard time beleiveing a doctor would ever recommend solids for an infant at 2 months, but i have an even harder time believing that a doctor would recommend solids for an infant with extreme allergies. this can be very harmful to your baby! typical infants are born with extremely sensitive and underdeveloped digestive systems, then they start maturing as they grow, which is why no solids are recommended before a certain age. solids can harm and irritate the digestive system in normal infants, i cant imagine how much worse it would be in an infant with allergies!
do the best you can ok? i am so sorry that you are having to deal with this kind of thing with your baby at such a young, tender and vulnerable age. i wish you luck moving forward, and i hope that you can figure out what works best for your baby.