How will children dedicated to God by their parents (Waqf-e-Nau) develop?

That cannot be said in advance. It depends on the children themselves, on the care of their parents and on the influence of their surroundings. As adults they then decide for themselves whether to confirm the dedication.

Waqf-e-Nau means that parents dedicate a child to the service of faith even before it is born. In doing so they follow an ancient example. The mother of Mary did the same, as the verse above relates, and God accepted her vow.

How these children will turn out is something no one can fix in advance. A vow made by the parents does not turn a child into a particular kind of person. Much depends on the children themselves, on their gifts and their character. Some will carry this dedication with joy, others will first have to find their own way to it.

Much also depends on the parents. A vow on its own is not enough. Parents have to look after the child and keep gently reminding it of the task and the responsibility that come with the dedication. The child has been entrusted to them, as the hadith above says.

Finally there is the environment. At the latest when young people go to college or university, friends, teachers and the wider society around them begin to shape them. What they received at home then has to prove itself in their own lives.

That is why the dedication comes with a condition. The parents make it on the child's behalf, but once the children are grown up and independent, they decide for themselves. Whoever then affirms it carries it by their own choice. That is what gives it its real worth.