http://www.islamweb.net/emainpage/index.php?page=articles&id=140381

With the advent of Islam, the darkness of that era vanished and Allaah enjoined kindness, love and compassion towards girls. Taking good care of girls was encouraged, as was giving them special attention in the process of their upbringing. In fact, Islam has designated a special reward for raising them that is not granted for raising sons. Anas may Allaah be pleased with him reported that the Prophet sallallaahu `alayhi wa sallam ( may Allaah exalt his mention ) said: "He who raises two daughters until their puberty will be with me in Paradise like this", and he symbolized the proximity by showing two of his fingers with a slight gap between them." (Muslim)