English remains the primary language spoken by most healthcare providers in New Zealand. Research globally has shown that for those in whom the primary household language is not the most widely spoken language of their country, there are implications for healthcare seeking behaviours. Disadvantaged socioeconomic status adversely affects health outcomes, and a disproportionately large proportion of families living in situations of socioeconomic disadvantage do not speak English as their primary language. This study will use the Growing Up in New Zealand (GUiNZ) data to analyse child healthcare utilisation and healthcare practices among New Zealand families for whom English is not their first language. We will investigate whether the primary language of a household in New Zealand is independently associated with healthcare utilisation and healthcare outcomes in the first year of life. With respect to healthcare utilisation, we will describe well childcare utilisation during infancy, the relationship with primary healthcare during infancy and attendance at and admissions to hospital before a child’s first birthday.With respect to healthcare practices, we will describe timeliness of receipt of the primary immunisation series, and the extent to which feeding practices are adherent to the New Zealand Infant Feeding Guidelines. We will then compare healthcare utilisation and healthcare practices between groups defined by whether English is the primary language spoken in the household. These comparisons will be performed for the whole cohort and within subgroups defined by global region of birth of the parents of cohort children and by parental ethnicity.