Sunday, October 2, 2011

Development of The Fetus for The First Trimester


Welcome to your fetal development area! Here's where you can see what's happening with your baby week-by-week!
Calculating the day your baby begins to develop and keeping track of your pregnancy dates can be a challenge. The development of pregnancy is counted from the first day of the woman’s last normal period, even though the development of the fetus does not begin until conception. Pregnancy is calculated from this day because each time a woman has a period, her body is preparing for pregnancy.

The following information is used as a general guide for healthy pregnancy development, although development may vary due to the mother’s health or a miscalculation of ovulation. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP), and fetal age is the actual age of the growing baby. Most references to pregnancy are usually in gestational age rather than fetal age development, but we have included both so that it is clear what stage development is at. Measurements will be given in total length from head to toe, but each pregnancy can differ in weight and length measurements, and these are just a general guideline.

Pregnancy is also divided into trimesters which last about 12 - 14 weeks each. Similar to development, these can be calculated from different dates so not all trimester calculations will equal the same. The following information divides the three trimesters into a little over 3 completed months each. The first trimester is week 1 through the end of week 13. The second trimester usually ends around the 26th week and consists of the 4th, 5th and 6th completed months. The third trimester can end anywhere between the 38th - 42nd week and is the 7th, 8th and 9th completed months of pregnancy.

Development of The Fetus for The First Trimester

Day 1 0 weeks 1 day Approximate day of your last menstrual cycle.
Day 2 0 weeks 2 days If you smoke, this is the time to quit. Speak to your doctor about smoking cessation program.
Day 3 0 weeks 3 days Speak to your health care provider about any current medications and their health risks to developing fetus.
Day 4 0 weeks 4 days Look at your work and home environment for potential environmental hazards.
Day 5 0 weeks 5 days Schedule a dental exam prior to pregnancy to take care of any necessary dental work to avoid unnecessary exposure to x-rays.
Day 6 0 weeks 6 days Taking prenatal vitamins now with extra folic acid helps promote maternal and fetal health and prevent neural tube defects.
Day 7 1 week Alcohol and drugs are a serious threat fetal development. They should be avoided during pregnancy.
Day 8 1 week 1 day Getting a health physical for you and your partner prior to conception is helpful to avoid potential medical problems.
Day 9 1 week 2 days Now is the time to talk with your partner about parenting and pregnancy.
Day 10 1 week 3 days Ovulation should be occurring within the next several days. Look for increased mucus in vaginal secretions.
Day 11 1 week 4 days Caffeine's effect on developing baby is unknown. It is best to avoid caffeine during pregnancy.
Day 12 1 week 5 days If you have a regular exercise routine, usually there is no reason to stop.
Day 13 1 week 6 days If you haven't found a doctor or midwife, now is a good time to start looking for one.
Day 14 2 weeks Based on a 28 day cycle, today is the approximate date of conception.
Day 15 2 weeks 1 day Once sperm enters egg, the egg splits and forms nuclei of ovum. Sperm nucei and ovum nuclei join and this is fertilization.
Day 16 2 weeks 2 days Until day 15 baby is considered a zygote.
Day 17 2 weeks 3 days Sex of your baby is determined at the moment of fertilization.
Day 18 2 weeks 4 days Zygote is rapidly dividing and is surrounded by the zona pellucida The zona pellucida holds the cells together.
Day 19 2 weeks 5 days The inner solid ball of cells is called the blastocyst.
Day 20 2 weeks 6 days The zona pellucida is replaced by the trophoblast.
Day 21 3 weeks The zygote is fed by uterine "milk" (or secretions from uterine glands) at this time.
Day 22 3 weeks 1 day Between days 7-10 from fertilization implantation usually occurs.
Day 23 3 weeks 2 days The amniotic sac begins to form at the time of implantation.
Day 24 3 weeks 3 days The yolk sac and umbilical cord also begin to form.
Day 25 3 weeks 4 days It is possible to receive positive results from a home pregnancy test at this time, but they are more accurate if taken after a missed period.
Day 26 3 weeks 5 days You may be feeling symptoms of pregnancy now such as nausea, fatigue, and breast tenderness.
Day 27 3 weeks 6 days You may be noticing more frequent urination and increased vaginal discharge.
Day 28 4 weeks If you have a 28 day cycle, you should note an absence of your menstrual cycle today.
Day 29 4 weeks 1 day Baby is approximately 1 mm long.
Day 30 4 weeks 2 days Your baby is now called an embryo.
Day 31 4 weeks 3 days Baby's neural tube forms, heart begins to form, and blood begins to circulate.
Day 32 4 weeks 4 days Moms may notice nasal congestion and nosebleeds during pregnancy.
Day 33 4 weeks 5 days Mom's blood volume begins to increase. Mom's will have 45% more blood by the third trimester.
Day 34 4 weeks 6 days Baby's liver begins to function.
Day 35 5 weeks Mom's feelings about pregnancy range from ambivalence, excitement, to nervousness. All are normal.
Day 36 5 weeks 1 day Baby is approximately 2 mm long.
Day 37 5 weeks 2 days Eating dry crackers may help with morning sickness.
Day 38 5 weeks 3 days Mom's should plan rest periods throughout the day to help with fatigue.
Day 39 5 weeks 4 days Normal weight gain during pregnancy is 25 - 35 pounds. During the 1st trimester expect a 3 1/2 - 5 pound gain.
Day 40 5 weeks 5 days Baby's limb buds are noticeable now.
Day 41 5 weeks 6 days Baby's mouth, jaw, and esophagus are forming.
Day 42 6 weeks Baby's heart begins to beat, although only visible through ultrasound
Day 43 6 weeks 1 day Baby's crown to rump length is 4-6 mm. Baby weighs about 0.4 grams
Day 44 6 weeks 2 days Baby's brain begins to form and cranial nerves are formed.
Day 45 6 weeks 3 days Baby is C shaped now and has a tail.
Day 46 6 weeks 4 days Moms may be experiencing mood swings and/or irritability.
Day 47 6 weeks 5 days Baby's placenta development begins.
Day 48 6 weeks 6 days Baby's eyes, ears, mouth, nose, lip, tongue, and teeth are forming.
Day 49 7 weeks Moms should expect to have blood work done or scheduled at first prenatal appointment.
Day 50 7 weeks 1 day Baby's crown to rump length is 8 mm or 0.30 inches. Baby weighs about 0.8 grams.
Day 51 7 weeks 2 days Mom may notice changes in skin pigmentation during pregnancy.
Day 52 7 weeks 3 days Baby's bones begin to form.
Day 53 7 weeks 4 days Baby's mouth, nose, and lips are recognizable.
Day 54 7 weeks 5 days Baby's sex glands appear.
Day 55 7 weeks 6 days Moms may find acupuncture helps with morning sickness.
Day 56 8 weeks Baby's fingers and toes are present, although they may still be webbed.
Day 57 8 weeks 1 day Baby's crown to rump length is 12 mm or 0.50 inches. Baby weighs about 1 gram.
Day 58 8 weeks 2 days Baby's external ears are developing
Day 59 8 weeks 3 days Mom's clothing is probably getting tight now.
Day 60 8 weeks 4 days Washing your face several times a day may help with skin breakouts.
Day 61 8 weeks 5 days Baby's optic nerve and eyelids are developing.
Day 62 8 weeks 6 days Baby's arms and legs are moving now. This would be visible on ultrasound.
Day 63 9 weeks You may be able to hear your baby's heartbeat via doppler.
Day 64 9 weeks 1 day Baby's crown to rump length is 20 mm or 0.75 inches. Baby weighs about 2 grams.
Day 65 9 weeks 2 days Baby's muscles in trunk, limbs, and head are developing.
Day 66 9 weeks 3 days Male and female genitalia still look very similar.
Day 67 9 weeks 4 days Development of heart is complete.
Day 68 9 weeks 5 days Warm or cold compresses may help with headaches.
Day 69 9 weeks 6 days Your baby very clearly looks like a baby now.
Day 70 10 weeks Some women experience only mild pregnancy symptoms.
Day 71 10 weeks 1 day Baby's crown to rump length is 2.5-3.0 cm or 1.2 inches. Baby weighs about 3-5 grams or .25 ounces.
Day 72 10 weeks 2 days All organ systems and external structures are present now.
Day 73 10 weeks 3 days Baby's head is almost half of your baby's size.
Day 74 10 weeks 4 days Your baby's face is well formed.
Day 75 10 weeks 5 days Skipping meals because of morning sickness will likely make nausea worse. Eat small meals instead.
Day 76 10 weeks 6 days You might start wearing some maternity clothes now.
Day 77 11 weeks Pregnant moms require more oxygen. They may feel short of breath.
Day 78 11 weeks 1 day Baby's crown to rump length is 3-5 cm or 1.2-2.0 inches. Baby weighs about 8 grams.
Day 79 11 weeks 2 days Baby's fingers and toes begin growing soft nails.
Day 80 11 weeks 3 days Baby's intestines are developing.
Day 81 11 weeks 4 days Baby's bladder sac is formed.
Day 82 11 weeks 5 days Kegel exercises can help curb urinary incontinence.
Day 83 11 weeks 6 days Boy babies begin producing testosterone.
Day 84 12 weeks Congratulations! You have completed your first trimester.

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