Abstract
Those working with pregnant women know the situation well: whether a particular unborn baby is judged to be too small will partly depend on the choice of fetal biometric charts used. Some charts can increase the likelihood of finding a fetal measurement below a threshold for smallness by fourfold or more.1 Inconsistent chart use and overestimation of fetal smallness can result in cynicism, confusion, and anxiety for pregnant women and their caregivers at all stages of pregnancy. The stakes are especially high when smallness of biometric measures alone raises a red flag for aneuploidy, other genetic syndromes such as skeletal dysplasia, or fetal developmental abnormalities such as microcephaly.
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