小张就要做妈妈了,在盘算着孩子出生日期时,心里不免有几分担心:因为自己今年已三十有七,前些年因为忙于事业未敢要孩子,现在虽然事业有成,但年龄偏大,担心自己的宝宝出生后会出现心脏和神经系统的问题。小张的担心不是没有根据的。据临床观察和研究发现,先天性心脏病(以下简称先心病)和其他畸形的发生率与孕母的年龄 Xiao Zhang is going to be a mom. When counting her child’s date of birth, her heart can not help but feel worried: I am already thirty or seventy this year. I did not dare to have a child because of my career. Older, worried about their baby will be born after the heart and nervous system problems. Zhang worry is not unfounded. According to clinical observations and studies found that congenital heart disease (hereinafter referred to as congenital heart disease) and other deformities and the incidence of maternal age