While humans are born with instinctive psychological abilities like the ability to learn language, a child being able to induct the grammatical structure of their native language (thus a child born in China easily learns Chinese while a child born in Germany easily learns German), the successful development of more complex functions depend on experiencing the "good-enough" interaction with their earliest parenting figure, which for most children is their mother. Because of an infant's psychological immaturity, conflict between their desires and the needs of their parents are inevitable. Yet, from this, the child's mind usually expands healthffully. It is only when parents don't encourage their child's struggle for individuation that unneeded exaggerated tension occurs. Caused by the parents lacking knowledge about child development (a baby doesn't exit the womb with instructions), or the lingering effects of the parents' psychological struggles with their parents.