If a couple has a boy and a girl, thereby Halachically fulfilling the Mitzvah of Pru U’Rvu, then why is necessary to get a Heter for birth control?

  See here for a thorough analysis of the parameters of this Mitzvah:   https://asktherav.com/i-am-teaching-a-high-school-class-about-the-mitzva-of-pru-urvu-what-is-the-mitzvah-mdoiraisa-and-what-is-the-mitzva-mderabanan/#.XcvxTrulXq8.link   This link in itself deals with the basic premise in your question. In addition…

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