Speech is the foundation of reading, but we teach from print-to-speech, rather than from speech-to-print. A four or five year old may have difficulty generating natural curiosity about two-letter blends or the number of syllables in a word (as taught by traditional phonics instruction). Likewise, there is nothing inherently interesting about an initial or ending sound. Activities like identifying initial sounds, or clapping syllables, or counting phonemes, are isolated from meaningful words and are aimed at listening for phonemes rather than saying them.
However children are curious about how whole words get on paper because they already know a lot about spoken words. Piaget and Vygotsky both noted the role of curiosity, and observed that learning occurs when new information is linked to previously learned information. The purpose of the alphabet is to make spoken words visible. Therefore, instruction in the alphabet should demonstrate how it can be used to represent (previously learned) spoken words. Start with a few letters to sound out and spell words like CAT, HAT, FAT, SAT, and then gradually introduce new words that add to the previous letters and sounds already learned. Your child will be building new neural pathways for reading closely linked to what the brain already knows about words—their pronunciation and their meaning.