Children begin acquiring sociolinguistic variation at a young age, as early as 3-5 years old. Studies have found that preschoolers demonstrate sensitivity to social factors like formality of context and apply linguistic constraints in a similar way to adults. While phonological constraints may emerge before age 6, sensitivity to social meaning and ability to vary speech styles continues developing through childhood. Observation of one child's development suggests variable postvocalic R and short I tensing emerge between 17-36 months, indicating sociolinguistic competence develops early in parallel with other language skills.