If you're arguing from a purely utilitarian perspective, it seems you should argue to legalize not just abortion right up to birth, but also infanticide by pare

If you're arguing from a purely utilitarian perspective, it seems you should argue to legalize not just abortion right up to birth, but also infanticide by parents. If either parent can kill an unwanted child, then by definition all surviving children will be wanted by both parents, which solves the problem of one parent potentially being a "deadbeat" and the state having to step in, etc.