The dosage of amoxicillin for children is usually calculated according to their body weight. Generally, 20mg-40mg per kg is needed, and 1 dose is needed in 8 hours. For infants under 3 years old, the daily dose is 30mg per kg of body weight and should be administered once every 12 hours. 1 sachet of amoxicillin granules is 0.125g, which is 125mg. For children aged 3-5 years old, 1.5 sachets are needed; for children aged 5-10 years old, 2 sachets are needed; for children aged 10 years old and above, 2-3 sachets are needed each time, 3 times a day.