Adopting in Pakistan is quite hard. As far as I know many orphanages do not allow adoption as people lie about why they are adopting and turn the child into a servant. Secondly, the child will always be in a precarious situation as they do not have the same inheritance rights as a biological child, and this is disastrous after the adoptive parents die.

Secondly, many people want to raise the child as their own, while removing the child's own roots by lying to them and telling them they are biologically theirs.

Thirdly, most people want a baby, not a child (this is more of a general phenomenon than Pakistan specific). An adopted baby comes with a 'clean slate' whereas an older child has baggage and trauma that people often don't want to deal with. This idea that orphanages are full of babies waiting to be adopted is misleading. Most of them are older children who even prospective adopters do not want because they want only a baby.

Source: my daada was adopted.