My son is five and half months old, i am feeding him one table spoon of cereal once a day. I would like to know how much qty i should feed him and how many times a day. vani replied. hi ! even i have a 5 month old baby ! i started giving one - two teaspoon of cereal initially when she turned 4 months old but now as she is growing and as her taste has developed for it, i am giving her 2-1/2 tablespoon at a time. my doctor has suggested to give her cereal just once a day and the quantity should gradually go upto 1/2 cup. so ..... every doctor has his own opinion. what does your doctor say ? and then later on u can give the baby some other flavour like the oatmeal and the mixed fruit etc. all the best !