The INTERGROWTH-21st app allows healthcare providers and individuals alike to plot and assess size at birth for all newborns and follow the postnatal growth of preterm infants from birth until 64 weeks post-menstrual age, at which point the use of the WHO Child Growth standards is recommended. The INTERGROWTH-21st standards develop scientifically robust clinical tools to assess fetal growth and the nutritional status of newborn infants, as adjuncts to the recently produced WHO charts for children aged 0 to 5. These are now being incorporated into national and international maternal and neonatal programs.
More information on the standards can be found at: https://intergrowth21.com/research/intergrowth-21st
The full list of standards can be found at: https://intergrowth21.com/intergrowth-21st-applications-calculators