How much say do you think the Dad should have?

Jellybean

I ask this question as I have been pondering over this watching how men treat their pregnant partners. So for example should the other parent of the child have a say in what pregnancy vaccines the pregnant person has? What food they eat to make sure they are healthy? Making sure they have enough exercise etc. Do you think that the pregnant person has the full say, the final say or equally joint say with the other parent of their child? Should the other parent be able to stop the pregnant parent drinking or smoking for example?