Exam

Preterm Infant Growth

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Preterm Infant Growth, Preterm Infant Expected Growth Velocity

  1. Age 1 month from term (40 weeks gestation)
    1. Weight gain: 26-40 g/day
    2. Length gain: 3.0-4.5 cm/month
    3. Head Circumference gain: 1.6-2.5 cm/month
  2. Age 4 months from term (40 weeks gestation)
    1. Weight gain: 15-25 g/day
    2. Length gain: 2.3-3.6 cm/month
    3. Head Circumference gain: 0.8-1.4 cm/month
  3. Age 8 months from term (40 weeks gestation)
    1. Weight gain: 12-17 g/day
    2. Length gain: 1.0-2.0 cm/month
    3. Head Circumference gain: 0.3-0.8 cm/month
  4. Age 12 months from term (40 weeks gestation)
    1. Weight gain: 9-12 g/day
    2. Length gain: 0.8-1.5 cm/month
    3. Head Circumference gain: 0.2-0.4 cm/month
  5. Age 18 months from term (40 weeks gestation)
    1. Weight gain: 4-10 g/day
    2. Length gain: 0.7-1.3 cm/month
    3. Head Circumference gain: 0.1-0.4 cm/month
  • References
  1. Casey (1991) J Pediatr 119(4): 599-605 [PubMed]
  2. Gauer (2014) Am Fam Physician 90(4): 244-51 [PubMed]