Most children’s speech sound development follows a typical pattern. It is normal for children to replace some of the more difficult sounds with sounds which are easier to say. For example 'tar' for 'car' or 'poon' for 'spoon.'
However some children’s speech sounds may develop more slowly or in an unusual way. For example ‘har’ for car or ‘oo’ for spoon, ay-ee for baby. These children may need extra help to develop their speech sounds.
There are different stages to work through, which include both listening to and producing speech sounds. It is important that the child is confident at each stage before moving onto the next.