Synchronous hatching is defined as the adjustment, coordination, and control of development and hatching periods among embryos. To achieve synchronization, embryos modify their duration of incubation period and hatching periods, either by delaying or accelerating their embryonic development through "metabolic compensation". The heart rate may facilitate this communication, but its role in Caiman latirostris is unknown. This study evaluated whether intra- and inter-clutch hatching synchronization occurs through embryonic communication. Using eggs from four clutches at different developmental stages, we assessed the effects of mixed, individual, and control incubation treatments on heart rate, incubation period, hatching, and neonate fitness. Results revealed that mixed incubation accelerated metabolic rates, extending the incubation period without compromising hatchling development and health. Behavioral differences indicated possible some kind of exchange beyond metabolic adjustments. Also, these findings suggest heart rate as a mechanism for embryonic communication and development synchronization, though synchronous hatching was confined to eggs within the same clutch.