Hanh, born prematurely at 33 weeks weighing 1.6 kg, underwent surgery for an inguinal hernia three months later.

There's no set timeframe for when newborns can go outside. It depends on their health, the weather, and the environment.

My 8-year-old son has chronic otitis media. He recently got caught in the rain. Does rainwater entering his ears affect his condition? (Hong Anh, 36, Quang Nam)

Fluctuating weather, pollution, and crowded environments make children susceptible to fever, coughs, sore throats, and runny noses upon returning to school.