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"  Around 28 weeks, you may have a blood test for Rh antibodies if you are Rh negative and your partner is Rh-positive or unknown. If antibodies are not detected, you will be given an injection of Rh immune globulin at twenty-eight weeks to prevent Rh disease (which doesn&amp;#039;t usually occur until subsequent pregnancies). Rh disease can tag the baby&amp;#039;s red blood cells for destruction, causing anemia or other serious conditions. Baby&amp;#039;s length (CTH): 14.80 in Baby&amp;#039;s weight: 2.22 lbs "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.redbookmag.com/body/pregnancy-fertility/a5611/twenty-eight-weeks-pregnant/>