We do not notice large differences in the number of births on a particular day only between the last day of the previous year and the first day of the next year but also (to a lesser extent) between the last day of an individual month and the first day of the next month.
Sicer pa razlik v številu rojstnih dni ne opažamo samo med zadnjim dnem starega in prvim dnem novega leta, ampak podobno velja (le v manjšem obsegu) tudi za rojstne dni prebivalcev na zadnji dan meseca in na prvi dan naslednjega.