What Is a Digraph? (sh, ch, th Explained for Parents)

By Snappy Reading Team · Published July 14, 2026

Your child has been cheerfully reading cat, pin, and sun when they hit the word ship and do what makes complete sense to a new reader: sound out s… h… i… p. Four letters, four sounds, one word that does not work.

That moment is not a mistake to worry about. It is the exact moment to introduce digraphs, and a simple counting trick that makes the whole concept click.

What exactly is a digraph?

A digraph is a pair of letters that join together to produce one new sound, a sound that neither letter makes on its own. The most common ones children meet first are:

• sh as in ship, fish, shell
• ch as in chin, chop, lunch
• th as in thin, then, with
• wh as in when, wheel

The word “digraph” literally means “two writings” (from the Greek di- and graphos), which is a useful anchor: two letter shapes, one spoken sound.

The reading-science reason this matters: skilled reading depends on mapping graphemes (the written units) onto phonemes, the individual sounds of spoken language. A grapheme can be one letter (b for /b/) or more than one (sh for /sh/). As Ehri (2022), writing in The Reading Teacher, explains, “graphemes are one or more letters that symbolize single phonemes,” and teaching children to recognise multi-letter graphemes as single units is central to how efficient word reading builds up over time.

Why does my child try to say “s…h” instead of /sh/?

Because they are doing exactly what they were taught. Early phonics instruction gives children a superpower: one letter, one sound. That system works brilliantly for cat, lip, and hot. But it collides with digraphs, because s and h each already carry sounds that children know and trust.

The collision is predictable and has nothing to do with intelligence or effort. It is the natural outcome of learning a general rule before meeting an exception. A child who sounds out s-h is applying their phonics knowledge correctly, and that is genuinely worth celebrating even as you gently introduce the upgrade.

Understanding phonemic awareness, the ability to hear individual sounds in spoken words, lays useful groundwork here. When a child can already hear that the spoken word /ship/ has three sounds (/sh/, /i/, /p/) rather than four, they are primed to accept that “sh” on the page counts as one.

Which digraphs should children learn first?

Most structured phonics programmes introduce digraphs in roughly this sequence: sh and ch first (there are many decodable words to practise), then th (which represents two slightly different sounds: the voiceless /th/ in thin and the voiced /th/ in then). The digraphs wh and ph come later, partly because there are fewer early decodable words to build on.

The National Reading Panel (2000), in its review of reading research, found that systematic phonics instruction, the explicit teaching of grapheme-phoneme relationships in sequence, produces significantly stronger reading outcomes than approaches that teach little or no phonics. Those gains cover word reading, spelling, and reading comprehension together. A 2024 meta-analysis in Scientific Studies of Reading (Stalega et al.) of nearly 4,000 children from preschool through Grade 1 confirmed this: phonics instruction that connects sounds directly to their printed graphemes significantly outperforms training that teaches sounds in isolation. Consonant digraphs like sh, ch, and th are among the earliest multi-letter grapheme patterns in that systematic sequence.

How do I teach digraphs at home? (The counting trick)

The most practical tool to have ready is the finger-counting method.

When your child is sounding out a word with a digraph, hold up one finger, not two, as they say the digraph sound. If they start to split “sh” into two sounds, gently tap the two letters together and say: “These two work as a team. One sound. One finger.”

A short routine that works well at home:

1. Point and say. Cover the rest of the word. Point to the digraph. Say its sound aloud together: “/sh/.”
2. Feel it. For /sh/ and /th/, ask your child to notice what happens in their mouth and with their breath. The /sh/ sound is a single stream of air; you can hold it for as long as you breathe out. There is no break, no separate parts.
3. Blend with the rest. Once the digraph is locked in, uncover the rest of the word and blend normally. The same technique you use when practising blending individual sounds together applies here.
4. Hunt for it. Over the next few days, ask them to spot the digraph at the start, middle, and end of words: shop, mushroom, brush.

Keep each session to five minutes. Short and regular beats long and occasional every time.

For a step-by-step practice routine focused entirely on /sh/, the article on teaching the /sh/ sound at home walks through it in detail.

When are children usually ready to learn digraphs?

Digraphs typically arrive in the phonics curriculum after children have mastered two things. First, single letter sounds: they can produce the sound for every consonant and short vowel without having to stop and think. Second, basic CVC words: words like cat, pin, hot, bug where each letter carries one sound.

In most structured programmes, that places digraph introduction in late kindergarten or early first grade, though the sequence matters far more than any specific age. A child confident with CVC words is ready; one who is still shaky on individual sounds will find digraphs confusing at first.

A 2022 paper by Ehri in The Reading Teacher reinforced that teaching phonics through clear grapheme-phoneme units, explicitly identifying multi-letter graphemes like ch and sh as single units, supports the orthographic-mapping process by which spellings become stored in long-term memory. The more explicitly these patterns are named and practised, the more efficiently the reading system builds.

The 2024 Nation’s Report Card (NAGB, 2025) found that 40 percent of US fourth-graders scored below the NAEP Basic reading level, the highest proportion since 2002. Reading researchers point consistently to gaps in early foundational instruction as a contributing factor. Digraph instruction is one small but necessary part of that foundation, a rung on the ladder that makes everything above it more stable.

FAQ

Is sh one sound or two?

One sound. The letters s and h form a digraph: they team up to make a single /sh/ sound, not an s followed by an h. Teaching it as one sound from the start prevents the common sounding-out mistake where a child produces a word that does not exist.

What are the most common consonant digraphs?

The four digraphs children meet first are sh (ship, fish), ch (chin, lunch), th (thin, then), and wh (when, wheel). A fifth, ph (phone, graph), appears later and is mostly found in borrowed Greek-origin words.

What is the difference between a digraph and a blend?

A blend keeps both letter sounds audible: you can still hear /s/ and /t/ separately in stop. A digraph makes a brand-new sound where neither original letter sound survives. The /sh/ in ship sounds nothing like /s/ or /h/ alone. That distinction is the reason digraphs need to be taught explicitly.

When should my child learn digraphs?

Most children are ready for digraphs once they can confidently read short-vowel CVC words like cat, pin, and hot, typically during kindergarten or early first grade. The key signal is that individual letter sounds no longer require much conscious effort.

What is the counting trick for digraphs?

Hold up one finger for each sound as your child reads a word. The digraph pair (sh, ch, or th) gets one finger, not two. That physical anchor helps the idea stick: two letters share one voice slot.

My child keeps reading th as two sounds. What helps?

Ask them to touch their tongue lightly to the back of their top teeth and feel the airflow as they say /th/. The sound is one continuous stream. Two to three minutes of body-based practice, finding th at the start of thin, the middle of mother, and the end of bath, tends to do more than repeated drills.

If you would like your child to hear digraphs click into place, to reach the moment /sh/ or /ch/ stops being a stumbling block and starts being a reading tool, Snappy builds exactly these kinds of phonics building-block moments into short, playful sessions.

Reviewed against: National Reading Panel (2000); Ehri (2022), The Reading Teacher (grapheme-phoneme units in systematic phonics); Stalega et al. (2024), Scientific Studies of Reading; NAEP 2024 Nation's Report Card (NAGB, 2025).