Why is maternity of our age can not give birth successful wil that undergoing operation?

Thats not perticuarly true, sometimes during labour the baby presents in a way that a vaginal delivery is not possible, @ times the women's body fails to perform the way it should (not dialating) and endangers the baby so surgery is the only option

^^ agreed

There could be a host of other reasons too. For example, if there is a noticable drop in the baby's readings (i.e the breathing / heartbeat rate drops) or asphyxiation an emergency Cesarean would be needed to save the baby's life

Also depending on the postion the baby presents during labour - say for example breech (i.e bottom facing downwards)

or transverse lie (i.e baby lying sideways across the womb) would call for an emergency C-section. This is because if the mother's waters break whilst the child is lying transversely, could result in cord prolapse (i.e the cord emerging first before the baby) which could cause suffocation, brain damage and if not attended to immediately - death.