You cannot claim that you’re aborting your Down syndrome child because you don’t want him to “suffer.” First of all, killing a child so they don’t suffer is psychopath serial killer logic. You’re on the same moral plane as Andrea Yates. Second, children with Down syndrome are famously some of the happiest people you’ll ever meet in your life. They are not in fact living in a state of perpetual torment. So what’s really happening is that you’re killing your child so that YOU won’t suffer the inconvenience of caring for him. This is about freeing yourself of your own perceived suffering. If you’re going to be a child killing sociopath, at least be honest about it.
Satan got Adam and Eve to focus on one fruit when God had given them a whole garden. That's how he works. He gets you to focus on that one thing you don't have. Instead of all the blessings you do have.
Trust that God knows what you need, and will supply it when you need it.