Over the past 20 years I have listened to patients try to guess their babies' sex based on a variety of old wives' tales. In fact, there are only a few ways to determine it.
In many cases ultrasound can distinguish the sex, though I caution my patients about trusting the results. On occasion an ultrasound reading gets it wrong, in which case a pink room gets a quick coat of blue paint or vice versa.
The only tests that are 100% accurate are amniocentesis and a chorionic villus sampling. However, these tests are only performed for medical reasons, not just for sex determination.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.