One particular issue can be where a child picks up on inappropriate language and then brings it into the setting. As practitioners, we need to help children learn what is and isn’t socially acceptable in a variety of contexts.
Young children often experiment with using language in inventive ways, especially when they realise that the words they use get a reaction. If the reaction they get is one of shocked disapproval, this may well exacerbate rather than resolve the issue. Children tend to model the language they hear. They will pick up on what the adults around them say, as well as the language of friends and older siblings. It is therefore so important that you, as an adult the children look up to, are really careful with the words and language you use.
A certain level of experimentation is normal, as young children get used to what is and is not socially acceptable in different situations. However, an important part of your role is to help children control their impulses and adapt their behaviour to suit the context.
In order to deal with this behaviour at the nursery
To help find a solution you need to identify where this behaviour is coming from. For example if a child is hearing it from an older sibling, speak to the parents and ask them to have a word with the older child.