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1st month
The baby starts off as a blastocyst, a ball of cells. It will later transform into an embryo. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
2nd month
The heart, facial features, and limbs start to grow. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
3rd month
As the baby transitions from being an embryo to a fetus, the eyes and genitalia start to develop. The heartbeat can now be detected. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
4th month
During this time, the kidneys develop. The baby can see light from outside the womb. Also, gender can be detected. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
5th month
The baby will start to move soon. For right now, though, it can hear external sounds. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
6th month
The baby's movement, taste buds, and lungs are developing. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
7th month
The brain and nails develop. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
8th month
The lungs and nervous system develop. (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636) -
9th month
By this time the baby will be born either "early-term" (37 weeks), "full-term" (39 weeks), or "late-term" (41 weeks) (https://www.babycenter.com/pregnancy/your-baby/fetal-development-timeline_10357636)
