Pig body weight (BW) homogeneity across the entire production cycle plays an important role in the swine industry because it directly affects efficiency and farm occupation time, mainly in regards to the growing-finishing facilities. The aim of this study was to know if the BW variability is equally distributed along the pig productive life or is primarily important at one particular stage. A total of 433 crossbreed piglets [Pietrain × (Landrace ×x Large White)] from 40 litters were used. All diets were offered ad libitum. During the nursery period, piglets were fed a diet formulated to contain 11.0 MJ/kg NE, 20.2% CP and 1.37 Lys. Thereafter, the animals were moved to a growing-finishing facility. Pigs were fed the same commercial growing and finishing diets (10.0 MJ/kg NE, 16.0% CP, 0.95 Lys). All animals were individually weighed from birth until slaughter at d 2 (CF; cross fostering), d 28 (weaning), d 42 (14 d post-weaning), d 63 (35 d post-weaning) and every 3 weeks until pigs were slaughtered. The relationship between BW at one stage and the next succeeding one along the whole cycle was analyzed by using the CORR procedure of SAS. Moreover, the variability at all periods was calculated taking into account the coefficient of variation (CV, %) by using the MEANS procedure of SAS. A strong relationship was observed between 2 consecutive steps along the whole production cycle (Pearson Correlation Coefficient (r) ranging from 0.85 to 0.96 (P < 0.001) until the first group of pigs were slaughtered), except for the lactation period (from birth to weaning, r = 0.46, P > 0.001). At the same time, the CV was higher at the first stages (22.17% until 35 d post-weaning) and then decreased until slaughter (8.42%). Results showed that the events occurred in the first stages of pig life, but especially during the lactation period (in terms of variability), have a huge effect along the subsequent performance of pigs, suggesting a more accurate management for the smallest piglets just after birth.