Which term describes the early acquisition of a phoneme where 50% of children produce the sound correctly in 2 out of 3 positions?

The term that describes the early acquisition of a phoneme where 50% of children produce the sound correctly in 2 out of 3 positions is known as customary. This concept indicates a stage in speech development where children begin to use specific phonemes with some consistency, although not yet at a level that qualifies as mastery. In this phase, customary production reflects an emerging ability among young children to articulate certain sounds in various positions within words, demonstrating progress in their speech development. Being familiar with the term customary helps educators and clinicians understand the developmental milestones in phonological acquisition, guiding them in assessing and supporting children's speech and language growth effectively.