frequent ultrasounds and your baby
Some moms like to have ultrasound done for "entertainment" purpose. Lot of cool technologies are available now: 3D, making DVD of unborn baby, etc. Previous research on potential risks has suggested that excessive scanning could cause growth problems. When a tech said that your baby is hiding it simply means your baby is trying to get relieve from noise. I think that clinical ultrasounds have to be limited to medical purposes only.
So how many and often are safe? My opinion 2-3 ultrasounds during the pregnancy is enough if baby is healthy.