Final answer:
Inez's baby is in the fetal stage of prenatal development, typically characterized by the onset of fetal movements known as quickening around months four to five of pregnancy. The placenta is fully functional at this time, supporting the baby's growth.
Step-by-step explanation:
At five months pregnant, Inez is experiencing the fetal stage of her baby's development, which is when she feels the baby move. This phase lasts until delivery and starts the ninth week following fertilization. Pregnant women typically experience fetal movements, or quickening, around weeks 16–20 as the fetus grows and develops stronger limb movements. By the time the baby is five months old, vernix caseosa and possibly lanugo have covered most of their skin.
During this period, the fetus's organs and structures all continue to develop, and the placenta performs vital functions like producing hormones, processing waste, and supplying nutrition. Up until the baby is delivered, the placenta will continue to perform these tasks.