Cognitive scores at 18 months were directly and significantly influential on cognitive ability at 51 months only in the ‘maternal to centre-based care’ and ‘multi types’ patterns of childcare. Early and ongoing centre-based care predicted higher language ability at 36 months but its impact was not evident at 51 months. When girls entered centre-based care after they were 3 years old, their cognitive scores were negatively influenced. Low family SES was a risk factor for language ability at 36 months when children were not introduced to any non-parental care before the age of three years.