During pregnancy the diet of the mother will directly influence the nutritional environment of a fetus, which presumably will affect the development of the fetal nervous system, including the brain.10 We separated the prenatal diet, as reported by the mothers, into unhealthy and healthy factors. Healthy eating can be specified as a diet of nutrient-rich foods, with limited intake of salt, solid fats and added sugar.26 Healthy foods were thus defined as those high in protein (e.g. fish, pulses), dietary fibre (e.g. pulses) and in important nutrients such as folate, magnesium, potassium, and vitamins A, C and K (e.g. vegetables).26 Unhealthy foods were defined as being high in saturated fat (e.g. fast food), trans fat (e.g. junk food), salt (e.g. processed foods) and added sugar,26 which have been associated with obesity, poor health and sedentary lifestyles.27