The production of pleural effusion is mainly due to changes in the rate of pleural fluid production by the parietal pleura or the absorption of pleural fluid by the visceral pleura.

The inquirer asks about the issue of poor memory and insufficient expression ability, and inquires about how to treat it.

Down syndrome screening is conducted by examining the pregnant woman’s blood to assess the risk of the fetus having Down syndrome. If the risk is high, further diagnostic testing is recommended. There may be different booking requirements in different regions and hospitals, so it’s advisable to consult with local hospitals. The optimal screening time is between the 16th and 20th weeks of pregnancy.

Is it normal for a 12-and-a-half-year-old boy, approximately 150 cm tall, to have pubic hair growth?

Rapid breathing in a 4-year-old child may be due to fever. It is recommended that parents observe if the child has a fever and give them plenty of water.

A newborn baby often has watery eyes and cries a lot. Could this be a symptom of thyroid hyperactivity causing red, itchy eyes?

Repeated coughing and fever in children may be caused by inflammation. It is recommended to undergo a chest X-ray to determine if it is bronchopneumonia.

The child has been feverish for four days with intermittent low-grade fever of 39 degrees. They have only taken azithromycin and pediatric Erhu Qingre Granules, and used Merolin and paracetamol for fever reduction, but the symptoms have not improved.

Children’s hay fever and tonsillitis may be related to allergies.

Rickets is primarily caused by a deficiency in calcium, and can be improved through diet and outdoor activities.