The present study’s objective was to verify the influence of behavioral characteristics such as strength at birth and human assistance on growth of Guzerá breed calves until weaning, in addition to estimating the growth curve based on age, strength and need for human assistance of Guzerá animals. A total of 73 calves were used, 39 males and 34 females. The calves were classified according to the strength at birth (presence (1) or absence (0) and the need for human assistance (HA = 1 received assistance and HA = 0 received no assistance) 4 hours after calving occurred. The calves were weighed at birth (WB), at 120 ± 20 days (WA120) and during weaning at 210 ± 20 days (WW). The animals were divided into 5 weight classes according to the ages and weights measured. The models of Brody, Von Bertalanffy, Richards, Logístico and Gompertz were tested to estimate animals’ growth until weaning. The birth month of the calves, sex and the need of human assistance influenced (P