Unit
- Birth to 3 months: Infants produce reflexive cries and vegetative sounds; they startle to loud sounds and begin to coo by 2 months. These early vocalizations form the foundation for later speech production.
- 4 to 6 months: Babbling emerges with repeated syllables like ba-ba or da-da. Infants begin to localize sound, respond to their name, and show anticipation of routines through vocalizations.
- 7 to 12 months: Canonical babbling includes variegated combinations; first words typically appear around 12 months. Joint attention and gesture use (pointing, waving) support communicative intent.
- 12 to 18 months: Vocabulary expands from 1 to 50 words; children begin to produce simple word combinations like more milk. They follow simple commands without gestures and point to body parts on request.
- 18 to 24 months: Vocabulary spurt often occurs; two-word combinations become consistent. Children use pronouns me and mine, and understand simple wh- questions in context.
- 2 to 3 years: Phrases of 3 to 4 words appear; vocabulary reaches about 300 words. Children use past tense -ed and plurals inconsistently, and can follow two-step directions.
- 3 to 4 years: Sentences of 4 to 6 words with basic grammar; vocabulary around 1000 words. Children answer who, what, where questions and tell simple stories about recent events.
- 4 to 5 years: Complex sentences with conjunctions (because, and); vocabulary over 2000 words. Children produce most speech sounds correctly (except perhaps /r/, /s/, /l/), and use future tense and conditionals.
- 5 to 6 years: Children use sentences of 6 to 8 words with correct grammar most of the time. Vocabulary expands to about 2500 words. They can retell a story with a clear beginning, middle, and end, and understand time concepts like yesterday and tomorrow. Most speech sounds are mastered, including /r/, /s/, and /l/ in connected speech.
- 6 to 7 years: Children engage in conversational turn taking with topic maintenance over multiple exchanges. They understand and use comparative and superlative adjectives such as bigger and biggest. Narrative skills improve with the ability to sequence events logically. Phonological awareness skills, including rhyming and syllable blending, become more refined.
- 7 to 8 years: Children can interpret and produce figurative language like idioms and metaphors. They understand multiple meaning words and can adjust language for different listeners. Sentence structures become more complex with the use of subordinate clauses. They can follow three step directions and explain reasons for events.
Scope of Practice
Role: Speech-Language Pathology Assistant in Early Intervention Settings
Within scope:
- Administering developmental screening tools under the supervision of a licensed SLP
- Implementing language stimulation activities during play-based sessions
- Documenting child responses and progress toward therapy goals
- Providing parent coaching on strategies to encourage communication at home
- Preparing therapy materials and maintaining equipment
Outside scope:
- Interpreting screening results or making a diagnosis
- Modifying treatment goals without SLP approval
- Performing oral-motor exercises beyond guided practice
- Conducting standardized assessments independent of supervisor
- Developing individualized education program (IEP) goals
Quick Revision
- Milestones provide a framework for identifying typical development and potential delays.
- Early vocalizations progress from reflexive cries to purposeful babbling around 6 months.
- First words appear around 12 months, followed by a vocabulary explosion in toddlerhood.
- By age 5, children use complex sentences and most speech sounds correctly.