Background: The waiting time to the first conception plays a significant role in the determination of the fertility level of the society. It is not possible to have a direct observation of waiting time, so the waiting time is obtained from birth interval data. It holds an important place in infertility studies because the first birth interval is free from post-partum amenorrhea (PPA) and there is less chance to use any contraception. In past studies, it has been identified that different factors contribute to explaining the length of the first birth interval. Objective: In this paper, an attempt has been done to know the impact of a new factor i.e. female__ampersandsignrsquo;s height on waiting time to the first conception. Material __ampersandsignamp; Methods: Cox__ampersandsignrsquo;s proportional hazard model is used for this analysis. The data has been taken from the National Family Health Survey (NFHS) of Uttar Pradesh. Results: It has been observed that along with other factors, there is a significant impact of females__ampersandsignrsquo; height on waiting time to the first conception. The female has a height of more than 150.0 cm is found significantly 6 percent more likely to get conception earlier than the female having a height less than or equal to 150.0 cm.