<prompt> Average Duration of first stage of labour in primigravida is -6 hours12 hours16 hours18 hours  <response>: Ans. is b i.e., 12 hours StageDefinitionFirstFrom the onset of true labor to full dilation of cervix. Avg duration: 12 hours in primigravida 6 hours in multigravidaSecondFrom full dilation of cervix to birth of the baby.Avg duration : 2 hours in primi 30 mins in multi gravidaThirdFrom birth of the baby to delivery of the placenta. 15 minutesFourth1 h observation period following delivery of the placenta 