No two children are the same, so each child grows at his/her own pace. TNO tracks the growth and development of children in the Netherlands and uses the data to develop monitoring tools (e.g. growth charts) for professionals. TNO has also developed a growth calculator that parents and professionals can use to determine how tall a child is likely to grow.

Growth charts and other tools

Growth charts:

Tools for professionals:

  • Growth calculator for (semi-)professionals: a tool for the easy calculation of standard deviation scores (SDS) for children.
  • BMI meter for children: instrument for determining whether a child is underweight or overweight.

Tools for parents:

  • Growth calculator for parents: calculate how tall a child is likely to grow, and the percentage of its peers that are shorter or taller.
  • iGrow: this easy-to-use TNO app will tell you how tall your child is likely to grow and whether he/she has a healthy weight. You can also receive tips on healthy eating, exercise and sleep.


  • Fifth National Growth Study: this study recorded the height and weight of more than 20,000 children in the Netherlands. The data have been used to produce growth charts and to calculate, for example, the height and weight of children and young people in the Netherlands.
  • Weight loss in breastfed babies: TNO has calculated a reference range of values for average, normal, weight loss in neonates in the first ten days of life.
  • D-score and D-screening: the D-score (Developmental Score) is a new measure for using the Van Wiechen Scheme. It measures the development of children between 0 and 2 years, and compares it to that of their peers. D-screening has been developed to identify young children at risk of a general developmental deficit. The instrument is based on the D-score and on the background characteristics of parent and child.


Prof. dr. Stef van Buuren