[Olivia]

Weeks 1-2: The body begins preparing for conception; ovulation occurs.
Week 3: Fertilization occurs, causing the sperm and egg to join together to create a new life.
Week 4: The embryo resembles a cluster of rapidly dividing cells.
Week 5: The foundations of the heart, blood vessels, and respiratory system begin to form.
6–7 weeks: the rudiments of the limbs appear, the brain and digestive tract begin to develop.
Weeks 8–9: Facial features such as ears, nose, and lips begin to form; the brain develops rapidly.
10–11 weeks: tooth buds are formed, the baby is surrounded by amniotic fluid, and the external genitalia appear.
Weeks 12–13: All major organ systems are present; the placenta is fully formed.
Weeks 14–15: The baby’s body is covered with fine hairs (lanugo) and vernix caseosa for protection. The tiny heart pumps large amounts of blood.
Weeks 16–17: Facial muscles allow frowning and blinking; brown fat tissue develops to regulate body temperature.
18–20 weeks: The baby begins to hear sounds, respond to the mother’s voice and move actively.
Weeks 21–22: Blood cells needed for immunity develop; taste buds begin to recognize the taste of amniotic fluid.
Weeks 23–24: Subcutaneous fat begins to accumulate; the baby takes up more space in the uterus.
Week 25–26: Bones and joints are getting stronger; eyes can now be opened.
Weeks 27–29: The third trimester begins; the brain develops rapidly, and thermoregulation improves.
30–31 weeks: The baby responds to light and sound; movements become stronger.
32–34 weeks: Hearing is well developed; the baby recognizes the heartbeat and the mother’s voice.
35–36 weeks: weekly weight gain increases by approximately 200 g; cheeks become fuller.
37–38 weeks: The baby is considered full-term and ready for birth; lanugo disappears.
Weeks 39–40: Movements slow down as the body prepares for labor.
41–42 weeks: The baby has long nails, hair, and open eyes; birth is expected any minute.

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