https://www.speechandlanguagekids.com... Unstressed syllable deletion, also known as weak syllable deletion or syllable reduction, is the phonological process that occurs when a child deletes one or more syllables from a multisyllabic word.  For example, "umbrella" might become "brella".  This is common up through the age of 4 years.  Then we expect it to disappear.  If the child is still using that process after that, we can use these strategies: