My baby is now two and a half weeks old. For the past few months, every month

Patient's question:

My baby is now two and a half weeks old. For the past few months, she has had a few episodes of crying out in pain each month, with the pain location being inconsistent (the exact spot might be hard to describe). She didn’t cry much, and rubbing her legs usually made it better. The doctor said it was growing pains. Yesterday, starting from dinner time until 10 PM, she cried out three or four times and couldn’t stop crying. So I took her to the hospital for emergency care. This morning, I went to the hospital again, and she was seen by both orthopedics and pediatrics. The orthopedic doctor examined her knee and said there was nothing wrong. The pediatrician still said it was growing pains. So, I’m here to ask for some advice—what are the common causes of knee pain in babies this age? And what should I do

Doctor's answer:

Disease Analysis: Generally speaking, if there is a lack of calcium, some blood trace element tests should be conducted.
Suggestions: Growing pains are more common in children who develop rapidly. They are usually rest-related pains at night. The choice is local heat application and reducing physical activity. It will gradually improve.