My wife and I had to abort out 3mo unborn child due to complications. Now my wife is very upset with me and I don't know what to do. How do I console her?

Abortion is up to God. if a baby is not growing well, it will naturally abort itself. If baby's condition is not viable after birth, he will pass away. Letting God naturally take away the baby will help you go through the sadness with no regrets. But deciding on your own to abort your baby will cause some remorse and regret leading to depression. Together ask God for forgiveness for choosing to end a life that is now causing you regrets. Receive forgiveness together from God. Then be there for your wife and guide her into light and Truth.