Kids cry for a reason. Do you think it's a good idea to "stop" emotional release? There are an awful lot of people (adults) who are very disconnected from their emotions, who aren't emotionally available in their intimate relationships or to their children, and who aren't expressive of anything much (except anger.)
The term "arrested development" exists for a reason!!!
Crying when hurt or sad is an important, logical result. Crying or tantruming to express unhappiness & frustration with what is happening also is a congruent expression of what's going on, emotionally, for the child! Children encounter feelings of powerlessness & helplessness when they can't make things go their way, and THOSE are feelings that need expression in order to find resolution (they grieve the loss.) Feeling their complete powerlessness usually is too threatening & overwhelming, so they feel rage instead.
Notice how your child's behavior makes sense.
at 6:35 AM on Nov. 13, 2013