Baby business


The purpose of this activity is for students to make predictions about future weight and height of a baby based on statistical data.

Description of Mathematics

The background knowledge presumed for this task is outlined in the diagram below:

This activity should be used in a ‘free exploration’ way with an expectation that students will justify the solutions that they find.


If a baby has a weight of 4.5 kilograms and a length of 57 centimetres at six weeks old, what is their expected weight and height at age 5 years?

What is the predicted height of the baby when he or she is an adult?

You will need access to growth charts such as those at: 

The procedural approach (show more)

  • The student uses a deterministic approach to predict the height and weight of the baby.

The conceptual approach (show more)

  • The student acknowledges potential sources of variation in making predictions for the weight and height of the baby.

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