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This study protocol descibes the the objectives, design and implementation of the Fetal Growth Longitudinal Study (FGLS), the Preterm Postnatal Followup Study (PPFS), and the Newborn Cross Sectional Study (NCSS). Data from these studies inform new, international fetal and newborn growth standards and a package of accompanying resources, including a new international equation for estimating gestational age through ultrasound.