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Birth Weight

Healthy newborn babies, even if they do not have any apparent problems, have many needs and more or less routine procedures. A careful evaluation of their general state of health and implementation of correct nutrition is important.

Newborns are considered apparently healthy if they are full-term (equal to or more than 37 weeks of gestation), and their background (family, gestational and pre-natal), physical examination and adaptation certify it.

A normal weight at birth is between 2500 gr. and 4000 gr. An underweight newborn is a full-term baby but has a birth weight of less than 2500 gr.

The identification of babies who are small for gestational age (SGA) is important because they have a greater risk of perinatal morbidity, and cardiovascular disorders as an adult. A baby who is small for gestational age describes SGA (small for gestational age) generally describes any infant whose birth weight and/or length was less than the 3rd percentile. An underweight newborn has a birth weight of less than 2500 gr.

A baby diagnosed with fetal macrosomia has a birth weight of more than 4000 gr., above the average weight of a full-term baby.

Fetal macrosomia is associated with a greater incidence of caesarian births and the mortality rate is higher. The metabolic complications in babies with fetal macrosomia (constitutionally bigger) are not more frequent than in normal weight newborns, but it is not always certain that a baby with fetal macrosomia will be healthy as it sometimes indicates that the gestational control was not correct.

Although it occurs even normal populations, diverse studies link fetal macrosomia to children of diabetic or obese mothers. These children may have a greater risk of developing type 2 diabetes mellitus, obesity and a metabolic disorder in infancy or adulthood.

Gene or region studied

  • 7p13
  • TCF7L2
  • CHRNA3
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