Newborn's eating and sleeping habits are different from before at 21 days, is it normal?

Patient's question:

Newborn is 21 days old. The past two nights, they have been eating every two hours, and after feeding, they still need some time before taking a nap. Previously, they were eating every three hours at night and falling asleep immediately after feeding. During the day, they need to finish eating, urinate, and then play in a cycle for four or five hours before sleeping. It used to be shorter. Is this normal?

Doctor's answer:

Normal newborns are fed every three hours during the day and 1 to 2 times at night. They sleep for 20 to 22 hours. Your child's sleep time is a bit short, and they wake up more frequently at night. The suspicion is that it may be due to calcium deficiency. It is recommended to take your child to the hospital to check for trace elements. If calcium deficiency is confirmed, oral vitamin AD drops and gluconate calcium are recommended. If there is no improvement, it is advised to revisit the hospital for further examination.

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