There are two types of lisps:

1. An Interdental Lisp.
An interdental lisp is when the tongue protrudes between the teeth on certain sounds (e.g. /s/ & /z/). This is considered a normally developing speech pattern in children. An interdental lisp can self-correct up to 6 years.
However, if a child still has a lisp by the end of Pre-primary it is strongly recommended that the child see a Speech Pathologist.

2. A Lateral Lisp.
A lateral lisp is when the child makes a ‘slushy’ sound on certain speech sounds (e.g./s/, /z/, /ch/, /sh). This is considered not to be a normally developing speech pattern. This type of speech disorder WILL NOT self-correct and speech therapy is required.