Of course he has a say, but he can't decide. The reason why he has a say it's because the baby is his as well. But, the reason why he can't make a decision [even though at first it may seem like he can because it's his child] , it is because it's the woman's body. He can't do anything to her, he can't literally stop her from aborting, he can't control the action, or the way the woman is treating her body in order to grow the child or not.
The woman may ask him, may listen to him, may even agree with him, but in the end she is the one responsible for the baby while the baby is in her body. This one stands even for the woman who desires to create a family - she may ruin it all with the way she behaves or eats, if she smokes, etc.