The new charts include:

  • new centiles – using nine centiles and extending from the 0.4th to the 99.6th centile
  • no centile lines for 1–2 weeks of age – because most babies lose some weight and then regain it during the two weeks after birth. A baby’s weight at about two weeks of age should be compared with their birth weight
  • a separate preterm birth section (in the combined growth charts and health professionals notes only, not in the Well Child Tamariki Ora My Health Book)
  • an adult height prediction and BMI look up (in the combined growth charts and health professionals notes only, not in the Well Child Tamariki Ora My Health Book).