There are only five vowel letters in the English alphabet (six if you count y) but more than 20 vowel sounds we use in everyday speech. Vowels are critical to language, and are among the first babbled by babies when they’re first learning to talk. But some children struggle with them. It could be a condition like childhood apraxia of speech. It could be difficulty with the shape of the mouth and positioning of the tongue and lips. Kids who have a hard time saying vowels properly will have a tough time communicating and (eventually) spelling the proper sounds. Cleveland speech therapy for kids can help.