You find out in Beyond Divinity what happened to the baby.
<span class='standouttext'>Spoiler : </span><span class='spoiler'>The baby from the end of DD is the main bad guy in BD (20 years later). The Divine One spared his life, hoping that by raising him properly, the aspect of the Lord of Chaos would not be allowed to grow and take control.</span> (highlight the text to read)
