It may be used in women when there is an increased risk of chromosomal abnormalities, such as in older mothers, he said. For this urban legend, a woman combines some of her first morning urine with the liquid drain cleaner. After 18 weeks of pregnancy and beyond, Carr said that ultrasounds have pretty good reliability for gender prediction if the baby is in a good position in the mother's uterus meaning that it is not in a breech, or feet-down position , and the legs are far enough apart that there is good visibility between them. These scans are done to produce keepsake pictures or videos, and not for medical reasons. The subsequent gender at birth was obtained from karyotyping reports or hospital birth records. The procedure is tightly regulated when it occurs in a hospital or medical clinic, he added. Of the patients it was possible to determine gender out of , the scan achieved an overall success rate of Unfortunately, "there's nothing to this idea, and Drano is really caustic," Carr pointed out. The scan is also done to see if a woman is having more than one baby, as well as to determine the location of the placenta and umbilical cord. Beyond ending the guessing game, there are medical reasons why mothers and fathers may want to learn the sex of their baby from an ultrasound. However I must say again that one must remember the sonologist may not always get a good view of the perineum private parts of the fetus for a variety of reasons and therefore may not furnish you with an "accurate" answer. My other 3 children were fine But when it comes to figuring out your baby's sex, how accurate are ultrasounds, really? In addition, ultrasound can identify certain birth defects, such as Down syndrome and spinal abnormalities, and investigate pregnancy complications, including miscarriage, according to the March of Dimes.