What Are Letter Sounds?

Every Letter Has a Sound

The English alphabet has 26 letters, and each one makes at least one sound. Learning these sounds — called phonics — is how children learn to read. The letter B says /b/ as in "ball." The letter M says /m/ as in "moon." When you know what sound each letter makes, you can string those sounds together to read words: C-A-T makes "cat." This is called decoding, and it's the foundational skill of reading.

Consonants and Vowels

The 26 letters split into two groups. Consonants (B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z) mostly make one predictable sound each. Vowels (A, E, I, O, U) are trickier — each vowel makes at least two sounds: a short sound (the "a" in "cat") and a long sound (the "a" in "cake," which says its own name). Y sometimes acts as a vowel too, like in "gym" or "happy."

Blending Sounds Together

Once you know individual letter sounds, the next step is blending — pushing sounds together smoothly to form words. Instead of saying "sss...uuu...nnn" as three separate sounds, you blend them into "sun." Practice makes this automatic. The more you blend, the faster you get, and eventually you recognize common words instantly without sounding them out at all.

Tricky Sounds

Some letters change their sound depending on context. C says /k/ before A, O, U (cat, cold, cup) but /s/ before E, I, Y (cent, city, cycle). G says /g/ before A, O, U (game, go, gum) but sometimes /j/ before E, I (gem, giant). And some letter pairs make entirely new sounds: SH says /sh/, CH says /ch/, TH says /th/. These are called digraphs — two letters, one sound.

Why This Matters

Letter sounds (phonemes) are the foundation of reading. Before a child can read a single word, they need to understand that letters represent sounds and that blending those sounds together produces words. This alphabetic principle is the essential insight that unlocks literacy. Research from the National Reading Panel confirms that systematic phonics instruction — explicitly teaching letter-sound relationships — is the most effective approach to early reading instruction.

Learning letter sounds also develops phonemic awareness, the ability to hear and manipulate individual sounds in spoken words. A child who can hear that "cat" is made of three sounds (/k/ /a/ /t/) is primed to connect those sounds to the letters c-a-t. This auditory skill is one of the strongest predictors of future reading success, even stronger than IQ or socioeconomic background.

Where Kids Get Stuck

The most common challenge is letters that make multiple sounds. The letter "c" says /k/ in "cat" but /s/ in "city." The letter "g" says /g/ in "goat" but /j/ in "giraffe." These inconsistencies confuse children who expect one letter = one sound. Teaching the most common sound first and introducing the alternate sound later (with explicit examples) reduces overload.

Another difficulty is consonant blends and digraphs. Children who can sound out c-a-t may struggle with "ch-a-t" or "str-eet" because multiple letters combine to produce a single sound (digraph) or a blended sound (blend). Explicitly teaching the most common blends (bl, cr, st, tr) and digraphs (ch, sh, th, wh) as units is more effective than having children figure them out on their own.

Many children also add an extra vowel sound to consonants, saying "buh" instead of /b/ or "tuh" instead of /t/. This makes blending difficult because "buh-a-tuh" doesn't sound like "bat." Teaching children to clip consonant sounds short — just the initial burst of air — dramatically improves their blending ability.

Try This at Home

• Sound boxes — Draw three connected boxes. Say a word like "dog." Your child puts a counter in each box as they say each sound: /d/ /o/ /g/.
• Letter sound walk — Choose a letter sound and walk around the house finding objects that start with that sound. "B" might give you bed, book, bowl, banana.
• Magnetic letter play — Use magnetic letters on the fridge. Build simple words (cat, sit, run) and then change one letter at a time: cat → hat → hot → hop.
• Rhyme time — Say a word and see how many rhyming words your child can generate. Rhyming helps children attend to the sounds within words.

For more ideas, see our guide: Phonics Guide for Parents.

Last reviewed: May 2026