When caring for children with respiratory issues in relationship to the anatomy and physiology of the child’s respiratory system, it is important to recognize which of the following?

Choice A reason: While lung development continues postnatally, significant maturation occurs in early childhood. Full alveolar development may continue into adolescence, but this statement is too broad and not the most relevant for acute care considerations. Choice B reason: Fetal shunts such as the ductus arteriosus and foramen ovale close after birth, but respiratory passages like the trachea and bronchi remain functional. This statement is misleading and anatomically incorrect. Choice C reason: Newborns primarily use diaphragmatic (abdominal) breathing due to immature intercostal muscles. Thoracic breathing becomes more prominent with age. This statement reverses the normal pattern. Choice D reason: Children have narrower airways than adults, which increases resistance and risk of obstruction. This anatomical difference is critical in pediatric respiratory care, influencing assessment and intervention strategies.