birth weight

Last reviewed 01/2018

The average normal birth weight at term is about 3.5 kg.

Definitions include:

  • low birth weight, LBW, less than 2.5 kg
  • very low birth weight, VLBW, between 1.0 and 1.5 kg
  • extremely low birth weight, ELBW, up to 1.0 kg

These terms refer to the weight at birth irrespective of the gestational age.