2.4. Child and Maternal Factors
Based on previous research and statistical significance, a number of child and maternal factors were assessed as covariates. Child sex (boy, girl), birth weight (low <2.5 kg, normal ≥2.5 kg), any breastfeeding duration (<6 months, ≥6 months), the timing of solid food introduction (<6 months, ≥6 months), maternal education (university (university degree and higher), pre-university (certificate/diploma/apprenticeship/high school)), maternal country of birth (Australia, another country), and maternal pre-pregnancy weight and height status (normal weight (<25 kg/m