Yes, especially when used unnecessarily. A routine ultrasound usually occur at 3 stages during pregnancy:
1 - Between 7 - 20 weeks of pregnancy, called a Booking scan. This gives an accurate date for due date
2 - 2nd trimester, called Anomaly scan. Mainly to detect gross anomalies, and can further be repeated for a detailed scan if needed. As well as to measure growth. High risk mothers (mothers who have underlying illness - DM, hypertension, etc.) would benefit greatly
3 - 3rd trimester, mainly to assess the growth of the fetus, liquor, determine placenta
It should only be used when necessary. All ultrasound emits soundwave through the skin and muscle, and some may enter the fetus. The energy transmitted can be controlled, however there are some test like Doppler ultrasound that needs even higher emission to view properly. For example, Doppler ultrasound is usually used when a doctor detects the baby is growing not according to plan, and also an important decision marker for early delivery to save the fetus.
Even if the "radiation" doesn't accumulate (like an x-ray does), there are some studies who doubt the benefit of ultrasound for unnecessary purposes. Now with new technologies like 3D imagings used for $$$, even more research is being done to assess the effect of ultrasound to these unborn babies so that technologies are not being abused.
Ultrasounds are safer for the baby. X-rays emit a possibly dangerous amount of radiation.
You don't. Inhaling anti-freeze can be dangerous. Just wait for an ultrasound.
because ultrasound is not radiation
Is there any signs on an ultrasound scane to show the sex of baby
An ultrasound scan will show if you have had a miscarriage. Sometimes you may bleed from near the placenta (afterbirth) but you don't miscarry and it will show this too. Sometimes you bleed and lose the baby but not all the placenta comes away which can be dangerous, causing bleeding and/or infection. the ultrasound scan can show all these things.
The benefit of using a 4D ultrasound is that people get to see the progress of their baby. The technology used in a 4D ultrasound allows a movie like feel since they can watch how their to be born baby is moving.
Ultrasound
Doctors use ultrasound to check the health of an unborn baby.
No, by that stage in a pregnancy, the baby would be ready to be delievered and would definitely show up on an ultrasound.
The sex of your baby can be determined by ultrasound at 16 weeks. Doctors will usually do an ultrasound at 20 weeks.
Its an ultrasound that uses sound waves, which gives you a clearer image of what your baby looks like!
It can be one of two things either you are not far enough along for the baby to appear on ultrasound or you have miscarried, which in that case you would have been made aware of when they did the ultrasound.