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Aim: An individual with a blood–injection–injury (BII) phobia often avoids exposure to triggers, such as blood tests and clinic appointments, leading to potentially serious health complications. This population‐based study examined the prevalence, stability and course of BII phobia in children and adolescents. Methods: The data came from the Trondheim Early Secure Study, conducted from 2007 to 2018. All children born in Trondheim, Norway, in 2003 and 2004 were invited to attend. Clinical interviews were conducted by trained personnel to assess BII phobia in 1042 children (51% female) every 2 years from 4 to 14 years of age. Latent growth curves and logistic regression analyses were used in the data analysis. Results: Just under 20% of the cohort experienced a BII phobia at least once, with no significant sex differences. The prevalence of BII phobias increased from 3% at 4 years of age and peaked at about 8% at 10 years of age, before levelling off. The two‐year stability increased as 12–14 years of age approached. Conclusion: The prevalence of BII was affected by age, but not sex. Early BII phobias often recede with time, but children may need treatment if they persist from 8 years of age. [ABSTRACT FROM AUTHOR]