The authors of this publication have developed a new screening method to evaluate the physical development of infants, which identifies growth and developmental restrictions based on their gestational age, gender, weight and length standard positions and nourishment status. This so-called MDN-method (MDN = Maturity, Development, Nourishment) offers several benefits: 1. It enables the expansion of the scope and definition of intrauterine growth restriction (IUGR) and the establishment of five separate condition subtypes. 2. It facilitates the study of the risk of mortality of infants based on their development and nourishment status. 3. The method is suitable for the screening of high-risk IUGR infants and neonates. 4. The MDN method allowed for the development of a new ultrasound screening methodology for high-risk IUGR infants and neonates, based on abdominal circumference (AC) and femur length (FL) standards, which correlate the most with the weight and length of the fetus. The data of 1,244,918 Hungarian live and stillbirths recorded during 2000-2012 were used for these studies. It is believed that these new screening methods may have a significant impact on reducing the frequency of IUGR-related stillbirth and infant mortality cases.