The Pediatrician Answers:
Artificially fed (bottlefed) infants should conform as much as possible to the normal breastfed feeding pattern. By forcing the baby to take large quantities of fluid and calories at a feeding, the baby may learn to overeat. This may lead to an increased tendency to become obese. Furthermore, the gastrointestinal tract of an infant at 2 months of age is still quite immature; all of the digestive enzymes are not fully developed and large proteins may be absorbed whole instead of being broken into useable components. Absorption of whole proteins is thought to be associated with development of food allergies. The undigestible rice starch could lead to upset stomachs and other digestive difficulties.
For these reasons, I would strongly recommend against adding rice starch to your baby's bottles. Allow your baby to feed normally; i.e., small, frequent feedings.