Is It Spank Children a Crime for Parents?

Recently,case of parents punish their children became an issue. Most of people said that spank children is a crime. For instance, the case of Malaysian family in Sweden. In my opinion, parents can punish their children according to the problem of the children made and do not too spoil their children. In Islamic religion, spank the children when they don't want to pray is one of method to teach them but it do when they not baligh yet. Other than that, parents need to show the affection to them and do good things as role model for them to learn and follow.