During month 8, which development occurs?

• A. The fetus's hair stops growing
• B. Lungs develop alveoli
• C. The retina forms new layers
• D. The brain stops developing

Answer: (B)

In the eighth month, the lungs are maturing, with the formation of alveoli to prepare for breathing after birth. Alveoli are the tiny air sacs where gas exchange happens, and their development, along with the production of surfactant that keeps those sacs from collapsing, is a key step toward readying the baby for air breathing outside the womb. Other options aren’t a hallmark of this month: hair growth isn’t paused here, since hair patterns and lanugo are transitioning later in gestation; the retina’s layered structure is largely established by this stage, with no new major layer formation specific to month eight; and the brain continues to develop, not stop growing, throughout pregnancy.