However, I think, I should mention that I cannot vouch for its effectiveness as I have not personally witnessed any stammering or lisp related cases in children being cured using this home remedy.
The remedy- Wash and clean a leaf of the Peepal tree [sacred fig tree] and stick about a teaspoon of Jaggery on it. Then give this leaf to the child and tell him to completely lick the Jaggery, which has been stuck on it. After the child finishes licking the Jaggery on the leaf, you can throw away the leaf. This home remedy should be practiced every day until positive results are gained.
The Jaggery used for this remedy has to be the one, which is normally used for preparing Chikki. This type of Jaggery is known as Chikki Jaggery and is commonly available in the market. Peepal leaves also find a place in certain other traditional Indian remedies, which are practiced to cure lisping and stammering in children.