20 weeks: If you are 9weeks, 4 days today, presumably by very reliable dates and you last, normal menstrual period began on september 15th, you will be 20 weeks on february 2nd. At that point, there should be enough organ development to accurately predict the baby's sex by ultrasound. Be careful painting the nursery early though: I have seen a number of cases in my practice where the ultrasound was wrong.
Answered 11/21/2012
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