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In this manuscript we investigated the presence of allometric relationships between the length of pregnancy and the body parameters in mammals. The relationships between the length of pregnancy T (d) and the square of body length H² (m²), body mass to surface ratio M/S (kg/m²), body-mass index (BMI)(M/H²) were investigated in mammals: Metatheria and Placentalia, including animals with body mass ranging from 8g in Common shrew to 15t in Killer whale. In result, the found power equations are: T = 114.3 (H²) 0352 ; T= 120.4 S038; T = 9.147 (M/S) 0757 and T = 17.6 BMI 0605. The study showed that the M/S ratio and BMI are nearly equivalent characteristics in relation to length of pregnancy. [ABSTRACT FROM AUTHOR]