Answer: If it is done for the benefit of the child, then it is positive. A person should not think that he would like to have children and so he adopts them; rather, he should consider what he wants to give to a child. Then he can adopt a child.
Usually, we love adopted children more than our biological children because we invest more effort into them, constantly proving our correct attitude toward them to ourselves.
From the Kabbalah Lesson in Russian 4/29/18