Is it advisable to stick to the same gynae for all your deliveries?

It is not necessary. For me, I have changed 3 gynaes during my first delivery. Since the experiences with the gynae is pleasant, so I decided to stick to her for my 2nd and 3rd pregnancy. But I do have friends who have different gynae for the 2nd pregnancy as they find the previous gynae is not good e.g. bad stitching skill, not pro-natural and etc.