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Your baby resembles a tadpole more than a human, but is growing fast. The circulatory system is beginning to form, and the tiny heart will start to beat this week.ref:babycenter
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Gestational Week 5 (Conceptual Week 3):
Week 5 is the beginning of the embryonic period which
lasts from the the 5th to the 10th week. During the embryonic period the
major organs will be formed from three layers of cells (germ layers). It
is during this critical period that many birth defects occur in the developing embryo.
Most of these birth defects will have no known cause or be due to a
combination of factors (multifactorial).
By the end of the week the heart is pumping blood. Although the beating heart is usually not seen this early, the embryo and or yolk sac may be seen on
sonogram this week.
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Although less than 5 percent of birth defects may be
attributed to external substances or maternal conditions, it is best to avoid
alcohol and unnecessary medications. It is also best to continue to take medications
that have been prescribed for you such as thyroid hormone, antibiotics,
and insulin or other medications for diabetes, since poor control of
maternal disease may have an unfavorable effect on your pregnancy. Most
health care providers advise waiting until after the first trimester to
use hair dyes.
You may experience breast tenderness
at this point in the pregnancy. As the pregnancy progresses you may expect
the areolae to enlarge and become more deeply pigmented.
You may also begin to experience worsening nausea and vomiting.
Nausea and vomiting of pregnancy are thought to be caused by high levels of
estrogen and human chorionic gonadotropin (HCG) (hormones that help maintain the
pregnancy). Up to 80 percent of women will eventually complain of nausea and or
vomiting during their pregnancies. Fortunately, these symptoms resolve in most
women by 20 weeks. Some measures may help reduce your nausea
in the meantime. See "Tips for
Reducing Nausea" . A more severe form of nausea and vomiting during pregnancy, called hyperemesis
gravidarum, can lead to
serious dehydration and derangements in components of the blood. Hospitalization
is often required to treat dehydration and
evaluate these patients for other possible causes of their symptoms .
Bleeding at this point during the pregnancy may be a sign of an early
miscarriage, a tubal pregnancy, or bleeding from the placenta, and should be
reported to your health care provider at once.
Table 1. Gestational Age When Organ Systems are Most
Sensitive to Birth Defects.
| Developmental stage | Embryonic Stage | Fetal Stage | |||||||||||
| Gestational Age (Months) | 1 | 2 | 3 | ||||||||||
| Gestational Age (Weeks) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Postconception Age (weeks) | 0 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| Developing Organ(s) | |||||||||||||
| CNS | |||||||||||||
| Heart | |||||||||||||
| Ear | |||||||||||||
| Eyes | |||||||||||||
| Limbs | |||||||||||||
| Lip | |||||||||||||
| Palate | |||||||||||||
| Teeth | |||||||||||||
| External genitals | |||||||||||||
| Weight ounces | 1.3 | 1.6 | 2 | 2.6 | |||||||||
| grams | 35 | 45 | 58 | 73 | |||||||||
| Length inches | 0.16 | 0.39 | 0.63 | 0.91 | 1.22 | 1.61 | 2.13 | 2.64 | |||||
| centimeters | 0.4 | 1 | 1.6 | 2.3 | 3.1 | 4.1 | 5.4 | 6.7 | |||||
1.Moore KL, Persaud TVN, The developing human: clinically oriented embryology, 7th edition, Saunders, 2003:520.
2. Sandler TW. Langmans’s Medical Embryology, 7th ed.Baltimore: William and Wilkins; 1995
3. Hadlock FP, et al. In utero analysis of fetal growth: a sonographic weight standard.Radiology. 1991;181:129-33.PUBMED
4. Hadlock FP, et al Fetal crown-rump length: reevaluation of relation to menstrual age (5-18 weeks) with high-resolution real-time US.Radiology. 1992;182(2):501-5. PUBMED
5. Quinla JD and Hill DA. Nausea and vomiting of pregnancy. Am Fam Physician. 2003 1;68(1):121-8. PUBMED
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