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Table 1 Rates of Pregnancy and Birth Complications in the US

From: Evidence based recommendations for an optimal prenatal supplement for women in the US: vitamins and related nutrients

Complication Rate
Infertility (women) 6%
Miscarriages 15–20% a
Gestational diabetes 8%
Preeclampsia 4%
Iron deficiency anemia in mother 27.5% in third trimester
Caesarean sections 32%
Still births 1%
Low birth weight 8%
Preterm births 10%
Postpartum depression 11.5%
  1. a The estimated rate of miscarriages after a woman knows she is pregnant is 15–20%, but the actual number of fertilized eggs that spontaneously abort is estimated to be up to 50%