The week scan is then time when most parents will know if they are having a boy or a girl.

The answer is 18-22 weeks. In this week it more noticeable in the ultra sound of what the gender the baby is a boy or a girl.  In pregnancy it I divided into 3 trimester, second trimester where the gender can reveal if the parents wants to know it ahead.

doctors i believe if i'm wrong sorry

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.