Perhaps a part of the problem touched upon by positivenayim is what seems to be a basic misundersantding that is somewhat prevalent of the words “self esteem” and “self worth”.
The term self worth mentioned by p”e is something deeply rooted in Chazal and is quite neccassary in proper chinuch. My understanding is that it connotates the basic need for a child to know the vast porential that is lies within him and there is something he and only he could accomplish “Bshvili Nivra HaOlam”.
Proper self worth is an obligation for when someone is truly aware of the amount he is capable of he must be aware that obligates him to fulfull his intrinsic capabilities.
Self Esteem, the way I understand it, is the opposite of this it stresses the inherent value of the individual regardless of what that person does. That is something which to the best of my knowledge has no basis in Chazal in fact Rav Shlomo Wolbe zt’l wrote a letter strongly condeming “self esteem” the way it is used in the modern world (see the kuntrus of Rav Shlomo Wolbe’s letters published in honor of his shloshim.
Self Worth teaches a child they are required to do as only they can, Self Esteem teaches they need not do for it makes no difference if they can.