The ability to learn language is value neutral. Each child will learn whatever is current parlance in the child’s environment. Some children will learn to mouth a string of obscenities, because that is what is modelled by parents, significant others, and other adults. Other children may learn specialised vocabulary if that is the linguistic climate they grow up in. For this reason some young children will learn words or phrases that many older children do not know, such as, for example, ‘biodegradable’ or ‘sibling rivalry’.
Very few 6 year-olds know these words, because few adults use them when talking to young children. But if a 6 year-old hears, for example, ‘sibling rivalry’ and someone explains it as ‘brothers and sisters fighting over something they both / all want’, the child will be able to accurately report “there’s a lot of sibling rivalry in our house.”
Contact me for more practical NLP advice if you have very young children in your family or immediate environment.