My child knows all the letter sounds but can't blend them into words

This is the single most common place early reading stalls, and it is almost never a sign that anything is wrong. Knowing that s says /s/ is one skill. Holding /s/ in mind while you fetch /a/, then holding both while you fetch /t/, then hearing the whole thing as sat — that is a different skill, and it has to be taught directly.

Why it happens

Blending is a working-memory task before it is a reading task. A five-year-old holds about three or four items in mind at once. By the time they have sounded out the third letter, the first one has often gone. So the child says "s… a… t… sun?" — not because they cannot read, but because the first sound was the only one left when they went to guess.

There are three usual causes, and they need different fixes:

The sounds are not automatic yet. If the child has to think for a second about what a says, blending will not happen. The sounds have to be instant.
The sounds are being said with an extra vowel. "buh-a-tuh" does not blend into bat. It blends into "buhatuh".
The child is being asked to blend in the wrong order. Sound-by-sound blending is harder than continuous blending, and most people teach the harder one first.

Fix one: stop adding the extra vowel

This matters more than anything else on this page. Stop sounds — /b/, /t/, /k/, /p/, /d/, /g/ — cannot be said on their own without a tiny vowel escaping. The goal is to make that vowel as small as possible.

Say /b/ as a quick puff, not "buh". Whisper it if that helps. The test: say the sound five times in a row. If you hear "buh buh buh buh buh" it is too strong. If you hear "b-b-b-b-b" you have it.

Where you can, start with the sounds that can be stretched instead: m, s, f, n, l, r, v, z and the vowels. These can be held as long as you like, which makes the next fix possible.

Fix two: continuous blending, not sound-by-sound

Instead of "/m/ … /a/ … /t/ … what word?", stretch straight through with no gaps at all:

"mmmmaaaat" — one unbroken breath, finger sliding under the letters as you go.

There is nothing to hold in memory, because nothing stops. The child hears the word fall out of the sounds. This is the single highest-leverage change most parents can make, and it usually works within a few days.

Once stretching works, shrink the stretch: "mmaat", then "mat". Do not rush this. A week on stretched blending is normal.

Fix three: build the word forwards, two sounds at a time

If continuous blending still does not land, make the memory load smaller still. Blend the first two sounds only, then add the third:

Say: "ma"        Child: "ma"
Say: "ma … t"    Child: "mat"

This is called successive blending, and it works because the child never holds more than two things at once. Use it for a week, then go back to continuous.

A four-question check to find the actual gap

Can they say the sound for each letter in under a second? If not, the problem is sound automaticity, not blending. Go back to letter sounds.
Can they blend when you say the sounds aloud, with no letters in front of them? If yes, the problem is visual — they are losing the sounds while decoding the print. Use a finger slide. If no, the problem is purely oral and letters are a distraction right now.
Can they blend two sounds — "at", "in", "up"? If not, start there. Two-sound words are a real stage and most programmes skip them.
Do they blend fine with stretchy sounds (m, s, f, n) and fall apart with stops (b, t, k)? That is the extra-vowel problem. Go back to fix one.

What not to do

Do not move to longer words to "build up to it". Do not let the child look at the picture — if the picture gives the word away, nothing is being practised. And do not practise for twenty minutes; a five-year-old has three to five minutes of attention for a task an adult chose. Two short goes a day beats one long one, every time.

Practise it free

Ladderbug's blending rungs stretch the sounds for the child, with no picture to guess from, and will not move on until blending is accurate on two separate days. No account and no card.

Try a blending rung

When to ask for help

If a child has had explicit, daily blending practice for three months and still cannot blend three sounds reliably, that is worth mentioning to their teacher, and worth asking about a screening for phonological processing. That is not a diagnosis and nothing on this page is — it is a reason to ask someone who can assess properly.

Written by the Ladderbug team. We build a free reading and math site for ages 4 to 11, so we have an interest here — where that interest might bend an answer, we have tried to say so on the page rather than hide it.