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Doctor insights on: How Big Is A Fetus At 29 Weeks Gestation

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How big should the gestational sac be at 5.5 weeks pregnant?

How big should the gestational sac be at 5.5 weeks pregnant?

10-15 mm: Varies based on accuracy of measurements, but in a normal pregnancy should be between 10-15mm in size (1-1.5cm, about 1/2 an inch). ...Read more

Dr. Tanya Russo
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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How big is your sac at 18 weeks pregnant?

How big is your sac at 18 weeks pregnant?

Can't Measure: We do not measure gestational sac size at 18 weeks. Routine measurements at 18 weeks are biparietal diameter (bpd) head circumference (hc), abdominal circumference (ac), and femur length (fl). Gestational sac size is not measured after 9 weeks when it averages about 33mms. Typically, the size of the pregnant uterus should be about an inch below the umbilicus. ...Read more

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How big would a baby be at 35 weeks pregnant?

How big would a baby be at 35 weeks pregnant?

See below: The average size at this gestational age is right around 6 pounds. ...Read more

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Is there a big difference in fetal development and maturation if a baby was born at 31 weeks compared to 35.5 weeks?

Is there a big difference in fetal development and maturation if a baby was born at 31 weeks compared to 35.5 weeks?

yes: You are talking about a difference of about ten percent and the difference between the two gestational ages is significant. Most 35 weekers will do ok from a lung perspective but many 31 weekers will have resp. Issues. Both are preemie but one is much closer to term. ...Read more

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How could warfarin effect an embryo that is 2 weeks old in fetal age (4 weeks gestational)? There isn't even a placenta yet

How could warfarin effect an embryo that is 2 weeks old in fetal age (4 weeks gestational)? There isn't even a placenta yet

Great question: This assumes that you know exactly when you conceived. We see women all the time who have incorrect dates based on irregular timing of ovulation, conception and implantation. The fact is, warfarin is 'teratogenic' in the first trimester. Why would you take this risk? Talk to an mfm specialist. ...Read more

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Is 14 weeks too early for the routine anatomy ultrasound? Is there a big difference in fetal size at 14 weeks and 18 wks?

Is 14 weeks too early for the routine anatomy ultrasound? Is there a big difference in fetal size at 14 weeks and 18 wks?

Yes way too early: 18 weeks is the lower limit for fetal anantomy scan, most are done 18-20 weeks so u need to be patient, u should ahae already had the integrated screen or one of the newer blood tests to r/o down's tri 13 and 18 you need to be patient. ...Read more

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At what week of a pregnancy is a fetus considered a real live baby?

At what week of a pregnancy is a fetus considered a real live baby?

Philosophical questi: That is not really fully a medical question - various factors come into play based on peoples upbringing and religious/moral beliefs. Some consider conception the beginning of life - some consider the baby only when it reaches the age where it is "viable" outside of mom (somewhere in the 24-26 week gestation). ...Read more

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Gestational sac measuring two weeks smaller than baby. Baby measuring normal for dates and hb is good. Why is the sac so small and is this a bad sign?

Small gest sac: Would not be too concerned about sac size. If CRL is appropriate and HB is good those are very good signs. Be patient. Too early yet to tell much. Hope this helps. Best of luck. And Congratulations! ...Read more

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How much does an average fetus weigh at 33 weeks of pregnancy?

How much does an average fetus weigh at 33 weeks of pregnancy?

3 to 3.5 pounds: The average fetal weight at 33 weeks is 3 to 3.5 pounds. But a fetus could be smaller or larger and still be normal. ...Read more

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Is there a big difference in maturation of a baby born at 31 weeks compared to 35 weeks?

Is there a big difference in maturation of a baby born at 31 weeks compared to 35 weeks?

Premie baby: Yes. Absolutely. The biggest and most important issue is that a 31 week baby does not gave matured lungs. The lung maturation that happens near the end of term is vital for health outside of the mother's body! ...Read more

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At 33 weeks baby already in the 80th percentile how big will it be full term?

At 33 weeks baby already in the 80th percentile how big will it be full term?

Big fetus: The most weiht gian is yet to come! are you a gestational diabetic or diabetic? Then you cna expect ur baby to be over weight when born. ...Read more

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Heartbeat at 6 weeks how likely is a miscarriage?

Heartbeat at 6 weeks how likely is a miscarriage?

Pregnancy: With a fetal heart rate at 6 weeks the chances of miscarriage are reduced significantly: to around 3 to 5%. Factors which increase the risk of miscarriage include prior obstetric history (like if the patient has had recurrent miscarriage), any systemic medical illnesses. And advanced maternal age. Good prenatal care is important to improve the chances of a successful pregnnacy. ...Read more

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If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

If its said that a 12 week old fetus measures 57 mm, than what is the gestational age of a fetus measuring 62mm?

12+4 weeks: Crown-rump length in fetus: 57 mm= 12+2 ( 50%) weeks, 62mm= 12+4 (50%) weeks reference: http://www.Bmus.Org/policies-guides/23-17-3-161_ultbmus.Pdf. ...Read more

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What is the size difference of a 9 week old fetus compared to a 12 week old fetus?

What is the  size difference of a 9 week old fetus compared to a 12 week old fetus?

23mm vs 57mm: The crown rump length of a 9 week fetus is 23mm (0.9 in). A 12 week fetus has a crl of 57mm (2.24 in). This does not include the length of the legs which cannot be reliably measured. ...Read more

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Is it possible to see a sack and a very tiny fetus at 4 weeks and 3 days on a regular ultrasound(not transvaginal)?

Is it possible to see a sack and a very tiny fetus at 4 weeks and 3 days on a regular ultrasound(not transvaginal)?

Possible: If u are not heavy, but u will need followup to make sure it is normal, u need a quant bhcg and a Progesterone level and another us at 6 1/2 weeks at that time should be able to see a small fetus with a htbeat. ...Read more

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Can a 8-9 week fetus measure big and be mistaken for a 12 week fetus?

Can a 8-9 week fetus measure big and be mistaken for a 12 week fetus?

No: The difference between 8-9 weeks pregnant and 12 weeks pregnant is very different on ultrasound. At this early stage, an ultrasound measurement is accurate to within a few days of how far pregnant you are. ...Read more