Introduction: Triclosan (TCS), extensively used in different cleaning and personal care products due to its antimicrobial properties, is an endocrine disruptor that has raised health concerns. Aim/Objective: To see the effects of exposure to sublethal dose of Triclosan on the development and function of reproductive system of female offspring rats in their early juvenile, pubertal and post pubertal stages of development. Method: F1 generation of female rats (experimental animals), obtained from TCS treated mother rats, were exposed orally to sub-lethal doses of TCS, according to the concentration given to their respective mother, from PND 19. The body weights, reproductive organ weights, onset of puberty and estrous cycle, serum gonadotropin and ovarian hormones and histology of ovaries and uteri were studied. Results: Pre-natal exposure to TCS through TCS-ingestion by mother rats did not affect the birth weights of the offspring. TCS treatment did not show change in the body weight gain at the end of one month when compared to untreated animals. Increased relative uterine and ovarian weights were observed upon TCS treatment. A dose dependent delay in the vaginal opening correlating with decreased serum level of FSH was observed indicating the disrupted hormonal balance that delayed the onset of puberty. TCS induced changes in number and growth of ovarian follicles and changes in thickness of uterine layers with increased width of uterine lumen was observed in all developmental phases. Prolonged TCS treatment till post pubertal stages of development induced decrease in FSH and Estradiol levels in the proliferative phases of estrous cycle and increased serum progesterone level sustained by increase in ovarian corpus luteum, thereby affecting the normal commencement of estrous cycle by increasing duration of metestrus-diestrus phases. Conclusion: Chronic exposure of environmentally relevant concentration of TCS to female rats induced altered gonadostat resetting and delayed puberty and early onset of reproductive senescence during reproductive development indicating possibilities of infertility.