Yes it is. Perhaps the reason is in the word "consciousness". Kids have high self-"consciousness", even as early as the toddler stage, which explains why they will feel a certain degree of shyness at that stage. When they are a little older (i.e. young kids), their self-consciousness is even greater. For instance, when they did something wrong (stealing from the cookie jar), they will feel shame and embarrassed.

Sub-consciousness is a term used by psychoanalysis, especially Freud. As much as the psychoanalytic theories exist, the results in proving the sub-conscious mind are not conclusive and should remain mere speculation of its existence. As you may have noticed, I'm not the biggest fan of psychoanalytic theory, even though "psychology" (the popularized version that we know of) in fact grew from Psychoanalytic theory.

Alright, back to the question. We know that kids are very much aware what they are doing, but they do not know that their choice in doing so may be wrong (or the best). Young kids up to adolescents are infamously known for their impulsiveness(which often times lead to doing stupid things). I bet everyone knows a certain friend from primary school or high school that did something so absurd and was punished for his behaviour. But then after a few years, he has changed into a mature family man having a stable life, as though he has became another person? We all know that friend of ours

The frontal-cortical areas of the brain oversee behavioral control through executive functions. Executive functions include abstract thinking, motivation, planning, attention to tasks and inhibition of impulsive responses. Impulsiveness generally refers to premature, unduly risky, poorly conceived actions. Dysfunctional impulsivity includes deficits in attention, lack of reflection and/or insensitivity to consequences. A fully developed frontal lobes takes about 21 years in average, thus anytime before this age, a kid/teenager/adolescent could be higher at risk for their impulsive behavior.

Of course we do have to realise there are other reasons for their "stupidity" behavior, such as peer pressure, adolescent egocentrisim, perceived invincibility (believing accidents only happen to others, not to themselves) and etc..

Adolescent egocentrism
According to Elkind (1967), adolescent egocentrism, which includes a belief by teenagers that they are special and unique, accompanies the attainment of new mental abilities. Specifically, Elkind proposed that adolescents construct an "imaginary audience," giving rise to heightened self-consciousness. Adolescents believe that others, especially peers, are watching them, thinking about them, and interested in all their thoughts and behaviors. Elkind suggested that this is due, in part, to emerging formal operational thought, which allows adolescents to think about their own thinking and that of others. Adolescent egocentrism actually represents a flaw in their thinking that is characteristic of early formal operations. Adolescents assume that since they spend a considerable amount of time thinking about themselves, others must be doing the same thing, namely, thinking about and monitoring them. They fail to realize that while they may be preoccupied with themselves, others are not so inclined.
http://findarticles.com/p/articles/mi_m224...ag=content;col1