Tetracycline should be avoided from:
Tetracycline when given from mid-pregnancy to 5 months of extrauterine life, the deciduous teeth are affected with discoloration. When given between 3 months to 6 years of age, they affect the crowns of permanent anterior dentition. They should be avoided from 4 months in utero to 8 years.
4 months to 8 years after birth
4 months in utero to 8 years after birth
4 weeks in utero to 8 years after birth
12 weeks in utero to 8 years after birth