My daughter start to eat the cereal when she is 4.5 months old, but just eat one spoon of cercel a day for one week. If she feel ok for the cereal, then add one more spoon. Follow this until become one bowl.
When she is 6 months old, she is ableto eat one bowl of cereal. The doctor and the nurse said start at 4 months old, it is because babies don't know how to eat without their bottle, it's a training for them.