Ontogenetic peculiarities of catecholaminergic regulation of three vitally important physiological processes are described: heart beating, respiration, and early somatomotor activity. They are subordinated to the autorhythmical regime and are submitted to modulating effects of noradrenergic and dopaminergic mechanisms. There are considered age-related changes of this effect whose peculiarity is polar changes of reactions in the process of their maturation from the predominantly excitatory reactions at early stages to the predominantly inhibitory ones.