Weaning is done in the age of 4 to 6 months depending on the baby's demand. But the process has to be very slow as the baby's liver and digestive is in developing stage. Initially at the age of 4 to 6 months you can only make your baby lick different tastes like fruit juices(fresh) then proper weaning is started at the age of six months. It is preffered to give baby home made food like khichri, suji or mashed fruits. Most parents prefer the baby cereals available in the stores. You can introduce them to your baby but in minimum quantity at this age. As the contain preservatives which are not good for health, like once a week but do not make a routine. Your baby must explore different tastes. By giving cereals only will also effect his digestion. So six months is the correct age. First try the rice one then you can introduce the wheat one at the age of eight months.