Context: The most alarming and disturbing aspect of census 2011 report is sharp fall in sex ratio of children (0-6 years) from 945 in 1991 and 927 in 2001 to 914 in 2011..There is enough evidence from the field that practice of female foeticide is the leading cause of skewed sex ratio in our country .To curb this menace of female feticide, it is imperative to assess the knowledge and attitude of future doctors about the causes and consequences of declining sex ratio. Aims: To know the knowledge and attitude of medical students on declining sex ratio.Settings and Design: A cross sectional, observational study. Methods and Material: Participants: 100 undergraduate medical students in 6th and 7th semester. Study Area: Classroom of Dr D Y Patil Medical College, Nerul, Navi Mumbai. Statistical analysis: proportions. Results: Our study underscores the knowledge and attitude of tomorrows doctors on skewed sex ratio in our country .Female participants had better knowledge on this issue in comparison to their male counterparts. Our study emphasizes the need to provide awareness to MBBS students regarding causes and consequences of declining sex ratio and also inculcate the ethics of medical profession at this starting point of their career.