<prompt> Infant mortality rate is -Death of infants per 1000 pregnent womenDeath of infants per 1000 birthsDeath of infants per 1000 live birthsDeath of infants per 1000 population  <response>: Ans. is c i.e., Death of infants per 1000 live births o IMR is defined as the number of death of child of less than 1 years of age per 1000 live births. It is a rate.IMR No. of death of less than 1 year age---No of live birthx 1000o The most common cause of infant mortality is prematurity and low birth weight 51 followed by in decreasing order acute respiratory infection 17, congenital malformations 5, diarrheal diseases 4, birth injuries 3, and cord infection2. 