In simple words: This code means the baby was born smaller than expected for how long the mother was pregnant.The baby's weight and length were both below average for their gestational age.

This code, P05.1, classifies newborns exhibiting symmetric growth restriction, characterized by both weight and length measurements falling below the 10th percentile for their gestational age.It signifies inadequate fetal growth, potentially stemming from various maternal or placental factors, resulting in a smaller-than-expected infant at birth.The diagnosis is based on standardized growth charts comparing the infant's weight and length to gestational age norms.Further specification may be needed regarding the degree of growth restriction.

Example 1: A 38-week gestation newborn weighing 2.0 kg and measuring 42 cm, falling below the 10th percentile for both weight and length. , A mother with poorly controlled gestational diabetes delivers a 36-week gestation baby weighing 1.8 kg and measuring 40 cm, exhibiting features of symmetric growth restriction., A baby born at 40 weeks gestation weighing 2.2kg and measuring 44cm. Both parameters are below the 10th percentile. The mother had hypertension throughout her pregnancy.

Detailed prenatal history, including maternal health conditions (e.g., hypertension, diabetes, infections), placental assessment (if available), ultrasound measurements of fetal growth throughout pregnancy, birth weight and length measurements, and neonatal physical examination findings.

** Further investigation into the etiology of symmetric intrauterine growth restriction is crucial for management and to identify potential long-term health implications for the newborn.The fifth digit may be added to further specify the degree of growth restriction.