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First Date of the Mother’s Last Menstrual Period
The first 2 weeks of the mother's menstrual cycle. She has her period. 2 weeks later, an egg is released from your ovary, called ovulation. -
When Conception/Fertilization Occurs
After the egg is released, it travels down the fallopian tube to the uterus, and combines with the sperm. This is the process of fertilization. -
When the Zygotic Stage of Development Begins
Cell division starts about 24-36 hours after conception. It reaches the uterus about 3-4 days after fertilization. The divided cells form a ball, which floats around the uterus for 2-3 days. The ball of cells then attaches to the lining of the uterus(Implantation), takes 3-4 days to complete. -
Week 4
The embryo is tinier than a grain of rice. Rapidly dividing cells are starting to form various body systems, including the digestive system. -
Embryonic Stage of Development Begins
Starts week 6. Many major parts begin to develop, including: the heart, arms and legs, the neural tube, and many more. This stage especially plays an important role in the development of the brain. -
The Heart is Now Beating
Week 7. As well as this, the placenta and amniotic sac begins to develop with the embryo. More specifically, the placenta burrows into the uterine wall to get oxygen/nutrients from the mom's blood. -
The Embryo Develops Into a Fetus
Happens after 10 weeks. -
Fingers and Toes Are Recognisable
However, still stuck together with webs of skin. 1st trimester combined screening test can be done around this time. During week 12. -
Hair Begins to Grow
Week 13. Fetus has CRL of 3 in. Roof of mouth is formed. -
Week 14
Eyelids are fused over eyes. Baby can now mutely cry, as it now has vocal cords. Fingers and toes are growing nails. -
Eyelashes and Eyebrows Appear
Fetus around 14 cm. in length. The 2nd trimester screening will be offered at this time if the 1st trimester test was not done. -
Fetus develops Lanugo and Vernix
Happens during week 19 of pregnancy. Fetus has a CRL of 6.5 in. A fine downy hair, Lanugo, covers the body. Skin also covered with a greasy material, Vernix, that protects the skin. -
Week 20
Fetus is about 21 cm in length. Ears are fully functioning, fingertips have prints, and now the genitals can be distinguished with an ultrasound. -
Taste Buds Begin to Form
Happens during week 22. Bone marrow also starts making blood cells. -
Eyelids Are Now Unfused
The eyelids are fused together 'til about 28 weeks. Fetus has a CRL of about 10 in. -
Lanugo Starts Falling Off
Happens during week 31. Fetus has CRL of about 11 in. Mother may get varicose veins, stretch marks, or hormones may make her hair seem fuller/healthier. -
Week 32
Baby spends most of its time asleep. Movements are firm and coordinated. Most likely has moved to the 'head down' position. -
Week 34
The eyes are developed enough for the fetus' pupils to constrict and dilate during exposure to light. Fetus has CRL of about 12 in. -
Week 36
Baby is around 46 cm. in length. The head is probably nestled into its mother's pelvis. If born now, chances for survival are excellent. Lung development is quick moving over the next few weeks. -
When the Baby is Considered Full-Term
The fetus has a CRL of about 13-14 in and now has a firm grasp.
At this point almost all of the vernix and lanugo are gone. -
The Due Date
Average newborn baby weighs 7-8 lbs. and between 18-22 in. long.
After the newborn has arrived, placenta and other tissues also come out, which is called the afterbirth. -
Sources
https://www.thebump.com/pregnancy-week-by-week ----I used this mostly for pictures https://www.plannedparenthood.org/learn/pregnancy/pregnancy-month-by-month -----I used this for information and timeline of events https://www.betterhealth.vic.gov.au/health/healthyliving/pregnancy-week-by-week -----I used this for information and to find important events during the pregnancy.
