Lisps are practically universal among small children who are learning to talk. In fact, they can be pretty darn cute. But when a lisp persists beyond a certain age, it’s time to consider whether speech therapy intervention is necessary.
Lisps usually last until about 4 years and 6 months, when they resolve on their own. Pay attention to your child’s peers and see whether your child’s speech stands out in this way. If your child is still talking with a lisp after age 4.5, it’s probably time to make an appointment for a speech therapy consultation. If the speech therapist recommends therapy, it’s best to start right away. The longer you wait, the harder the habit may be to fix.
It’s also a good idea to seek speech therapy services from a private clinic as opposed to relying on public schools to take care of it. It’s not that there aren’t good speech-language pathologists in schools (in fact, many are excellent). The issue is that many school therapists may not be able to treat a child with a lisp until age 7 or 8. Beyond that, if the lisp doesn’t directly impact the child’s education, school district speech therapists may not be able to treat them at all.