Final answer:
A child born with a small hole in the muscular wall between the right and left side of the heart has a condition called a septal defect. This condition must be fixed by surgery as soon as possible because it can lead to serious health complications.
Step-by-step explanation:
A child born with a small hole in the muscular wall between the right and left side of the heart has a condition called a septal defect. This condition must be fixed by surgery as soon as possible because it can lead to serious health complications. The hole allows blood to flow from the right ventricle, which has relatively low oxygen, into the left ventricle, which has relatively high oxygen. This mixing of oxygenated and deoxygenated blood can cause poor oxygen supply to the body, leading to symptoms such as difficulty breathing, low blood oxygen levels, and failure to grow and develop in children.