Phonemic awareness is the foundation everything else is built on — and when it's shaky, decoding almost always struggles down the road.
Here's why: before a child can decode an unfamiliar word, they have to understand that words are made of sounds — that those sounds can be isolated, blended, and manipulated. That awareness doesn't come automatically. It develops, and it needs to be taught explicitly for many children.
When a child has strong phonemic awareness early on, they're not just memorizing words — they're building a mental framework for how words work. So when they encounter an unfamiliar word at age 9 or 12, they have tools. They can break it apart, move through it systematically, and make a reasonable attempt — even if they've never seen it before.
Without that foundation, what I often see instead is guessing. A child will look at the first letter, glance at the shape of the word, and take a leap. That strategy works fine for simple, familiar text. It breaks down completely with complex or academic vocabulary.
One of the techniques I use early and often is syllabication — teaching children to see the natural breaks inside longer words. When a child knows how to divide "un-fa-mil-iar" before they try to read it, suddenly it's not one overwhelming string of letters. It's four manageable chunks they can decode piece by piece.
Phonemic awareness gives children that instinct. And in my experience, developing it early — even before formal reading instruction begins — makes an enormous difference in how confidently and independently a child reads for the rest of their life.