One of the most common lung difficulties we see, especially with c-section babies, is transient tachypnea of the newborn.
This occurs when there is still fluid in the lungs, because the baby didn't exit via the birth canal and literally have the fluid squeezed out. Infections can also occur resulting in pneumonia
. Some babies "transition" slowly, & need a little help learning to breath room air.
Answer assisted by David Escobar, Medical Student