Once the IVF treatment succeeds will the birth always be carried out through caesarean section?

The manner of birth is not determined by the manner of fertilisation, but by the course of the pregnancy, whether or not complications arise and by the course of the child birth itself. Therefore birth by caesarean section is by no means inevitable after IVF. Of more importance is that you give birth safely, whether that be naturally or by caesarean, and return home with a healthy child.