"Fetal gRowth AbnorMality dEtection Trial"

Inclusion Criteria: * Maternal age ≥ 18 years and ability to give informed consent. * Singleton gestation * Ultrasound examination that confirms or revises the EDD before 14 weeks of gestational age * Gestational age ≥ 35 weeks' gestation * Normal aneuploidy screening (1st trimester screening, 2nd trimester screening, integrated screening, NIPT) when performed * Spontaneously conceived pregnancy (i.e the current pregnancy is not the result of in vitro fertilization) Exclusion Criteria: * Fetal chromosomal or genetic abnormalities if invasive prenatal diagnosis is performed * Fetal malformations or soft markers identified on fetal anatomy survey * Episodes of uterine bleeding after 24 weeks gestation. Unobserved self-reported bleeding with confirmed intact pregnancy on ultrasound after the bleeding episode is not an exclusion criteria. * Uterine/placental abnormalities including uterine malformations (i.e bicornuate uterus, didelpus uterus), abnormal placentation (placenta previa, accreta, percreta), uterine fibroids. * Cerclage in the current pregnancy * History of intrauterine fetal demise * History of fetal growth restriction or birth weight \> 4Kg in a previous pregnancy * Fetal isoimmunization or alloimmunization * Fetal demise in previous pregnancies * Cancer (including melanoma but excluding other skin cancers). Dysplastic or pre-neoplatic conditions such as cervical intraepithelial neoplasia are admissible. * Endocrine disease including thyroid disease (recently dia…