An haifi Bieber a ranar 1 ga Maris, 1994, a London, Ontario, a asibitin St Joseph, kuma an tashe shi a Stratford, Ontario. Shi ne kadai yaro na Jeremy Jack Bieber da Patricia "Pattie" Mallette, waɗanda ba su yi aure ba. Mallette ba shi da shekaru a lokacin da ta haife shi, kuma mahaifiyarta Diane da mahaifinsa Bruce sun taimaka mata ta tayar da ɗanta. Mahaifiyarsa na asalin Faransa-Kanada ce; kakansa na mahaifinsa na asalin Jamusanci ne, kuma sauran tushensa Turanci ne, Scottish da Irish.
Saboda haka Marasa lafiya