The fetus's development continues and expands throughout the ninth month of the baby's developmental stage. At this stage of pregnancy, the lungs are fully developed. The ninth month is primarily the last month of brain growth and development. Here are some other progresses during the last month of pregnancy:

Week 33

The fetus's bones are hard, except the brain, as it needs to be soft to pass through the birth canal.

Week 34

The vernix, which protects the fetus's skin, begins to thicken.

Week 35

The fetus's brain grows but is still only two-thirds of its birth weight.

Week 36

The fetus has lost its lanugo and has hair on its head. The fetus is about 17 to 19 inches long and weighs 6 to 7 pounds.

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