While reading a rhyming book, explain to your preschooler that certain words sound alike.
Sing favorite songs repeatedly throughout the day.
Read nursery rhymes repeatedly. Try acting out some favorite rhymes with stuffed animals, puppets or other props.
Provide musical instruments whether store-bought or homemade so that preschoolers will listen for the rhythm of words.
Play "I Spy" by looking at an object. Think of a rhyming word for that object and say something like "I Spy something that rhymes with pear." (You could be looking at their teddy bear.)
Replace the beginning sounds of words with another sound. For example, if your preschooler wants a "banana," you could say, "Did you want a fanana?" See if they correct your mistake.