<prompt> Answer this question truthfullyCould you please tell me the meaning of fetal hemoglobin?  <response>: <reason> After the first 10 to 12 weeks of development, the fetus primary form of hemoglobin switches from embryonic hemoglobin to fetal hemoglobin. At birth, fetal hemoglobin comprises 50-95 of the childs hemoglobin. These levels decline after six months as adult hemoglobin synthesis is activated while fetal hemoglobin synthesis is deactivated. Soon after, adult hemoglobin hemoglobin A in particular takes over as the predominant form of hemoglobin in normal children. 