Touch a child
Of course you can spoil your child. You even want to give him the best, for fear that he will be hurt and unhappy. It is absolutely impossible for others to bully him. It is human nature to be very defensive.
Spoil a child
Accustomed to it, this word is generally used in a bad context. For example, if the child does something wrong or has other bad behaviors, but you let it go, there is no lower limit for connivance. If you think that everything the child does is right, then the child will easily grow crooked and distinguish right from wrong.