Inclusion Criteria:  The investigators involve every nullipara and multipara giving birth at 2nd Department of Obstetrics and Gynecology, University Hospital Bratislava and Comenius University, Bratislava, Slovak Republic in a period of two years  Exclusion Criteria:  unwilling to participate, minors (under 18 years old), high risk pregnancy, foetus mortus or perinatal death of the newborn, with slovak language, previous Caesarean section (for multipara)