Is it too late to do 4D color Doppler ultrasound at 29 weeks?

If you wait until the 29th week of pregnancy to do a four-dimensional color image, it is actually a bit late. It is best to go to the hospital for a four-dimensional color image around 12 weeks of pregnancy. This will make the results of the examination more accurate, and you can also find out early whether the fetus in your belly has some congenital diseases. If so, you must terminate the pregnancy immediately.

Special examination: Most obstetricians and gynecologists do not recommend B-ultrasound for pregnant women within 18 weeks of pregnancy, especially within 12 weeks of pregnancy. Because too many B-ultrasounds may be the "culprit" of abnormal embryonic cell division and human brain formation, as well as fetal skeletal maldevelopment, malformation or stillbirth. However, if a pregnant woman experiences a worrying situation in the early stages, such as vaginal bleeding or sudden abdominal pain, using B-ultrasound to determine whether the embryo is alive and whether the pregnancy can continue; whether there is an abnormal pregnancy like ectopic pregnancy or hydatidiform mole is the most direct and reliable method.

Second trimester

(4-6 months)

Routine check-up: The older the fetus, the less impact ultrasound has on the fetus. Therefore, under normal circumstances, expectant mothers will have their first B-ultrasound after 20 weeks. It can accurately diagnose whether the fetus is deformed and observe the activity status of internal organs; it can quickly give "answers" to those fetuses that are highly suspected, such as anencephaly, hydrocephalus, meningocele in neural tube defects, umbilical cord abnormalities, digestive tract abnormalities, conjoined twins, microcephaly, etc.

Special examination: If vaginal bleeding occurs in the second trimester of pregnancy, this may be placenta previa or placental abruption, and you should consult a doctor immediately. If the expectant mother's abdomen increases beyond the normal growth rate over a period of time, it is best to use B-ultrasound or other means to find out whether it is polyhydramnios, multiple pregnancy, or fetal malformation.

Late pregnancy

(7-9 months)

Routine check-up: During this stage, expectant mothers generally need to undergo two B-ultrasounds, which are scheduled at the 34th week of pregnancy and the 37th to 38th week respectively. The purpose is to monitor the amount of amniotic fluid, the position of the placenta, the maturity of the placenta and whether the fetus has any malformations, and to understand whether the fetal development is consistent with the gestational age. The last B-ultrasound examination will provide a reliable basis for determining the mode of delivery.

Special examination: Before 38 weeks, vaginal discharge, even a little bit of water is abnormal. This means that the amniotic membrane has ruptured and amniotic fluid has leaked out, which is commonly known as "premature rupture of membranes." Usually, the fetus will be born about 12 to 24 hours after "premature rupture of water". If a small amount of water flows out of the vagina intermittently for several days or longer, the fetus will have a greater chance of infection as it loses the complete protection of the amniotic membrane, the umbilical cord is prone to prolapse, and the mortality rate is higher. So, if this happens, lie down and go to the hospital immediately.