Is having a hole in the heart a very serious illness?

Patient's question:

Heart disease
Just turned one month old
Cries with a very soft voice
Nursing makes the milk flow
At night
Coughing
Hasn't been treated recently
Recently found a hole in the heart, smaller than a bean
Is this disease serious?
Is it easy to treat?

Doctor's answer:

A congenital heart disease refers to a local anatomical abnormality caused by the formation defect of the heart and major blood vessels, or an abnormal heart where channels that should close after birth fail to close (normal in fetuses). Except for some small ventricular septal defects that may heal on their own before the age of 5, the majority require surgical treatment.
The child is troubled by neonatal diseases, so the family must take the child to seek medical treatment immediately, avoiding the blind use of small advertisements for drugs. Rational medication is necessary. For parents, it is essential to provide the child with enough care and attention, and to do everything possible to help the child receive timely medical treatment for the disease.