It is normal for children to change their teeth at the age of 5. Usually children change their teeth around the age of 6, but the timing varies due to individual differences. Generally speaking, small children usually start to change their teeth around the age of 6, but in reality, there are relatively large individual differences in the timing of tooth replacement. Some children are rich in daily nutrients and develop faster, so they start to change their teeth at the age of five. While some children develop later, 7 to 8 years old can start to change teeth, these are within the normal range. All in all, it is normal for babies to change their teeth at the age of 5. During the period of tooth replacement, you can give your baby some hard food, which is good for promoting the growth and development of permanent teeth.