As speech‑language pathologists at Red Door Pediatric Therapy, we commonly see early communication differences that can signal autism. Below is an age‑ordered, clinically informed list of speech and language signs from birth through age 5, plus referral thresholds and practical strategies for caregivers and medical providers.
Birth to 6 Months:
- Limited or inconsistent eye contact during interaction or feeding.
- Rare or delayed social smile.
- Little back‑and‑forth vocalizing (cooing, gurgling) with caregivers.
- Atypical vocal quality (unusual cry, high/low pitch).
- Minimal orienting to caregiver voice or sounds.
6 to 12 Months:
- Reduced or absent canonical babbling (e.g., repetitive syllables such as “ba‑ba”)
by ~9 months. - Few or no social gestures (showing, waving, reaching to share).
- Limited reciprocal vocal play (no alternating “conversations” of sounds).
- Unusual vocalizations (squeals, repetitive noises) or atypical prosody.
- Little or inconsistent response to name.
12 to 18 Months:
- Delayed emergence of single words or slow transition from babble to words.
- Limited joint attention: does not follow/point to share interest; rarely shows objects.
- Words mainly used to request rather than to comment, share, or engage.
- Presence of echolalia (immediate or delayed repetition).
- Reduced eye contact paired with vocal attempts.
18 to 24 Months:
- Vocabulary significantly behind expected norms (fewer than ~50 words by 24 months
is concerning). - Few spontaneous communicative acts across functions (commenting, requesting,
protesting, greeting). - Persistent echolalia or scripting instead of flexible language.
- Reduced imitation of words and actions.
- Pronoun confusion or odd referential language may appear.
2 to 3 Years:
- Limited multiword combinations or reliance on scripted phrases.
- Difficulty with conversational turn‑taking and topic maintenance.
- Pragmatic deficits: poor initiation of joint attention, limited social reciprocity, trouble
repairing communication breakdowns. - Atypical prosody (monotone, sing‑song, atypical stress patterns).
- Repetitive use of phrases, narrow range of communicative intents.
3 to 5 Years:
- Persistent pragmatic language impairments despite growth in vocabulary and grammar.
- Poor back‑and‑forth exchanges, abrupt topic shifts, or perseveration on preferred topics.
- Limited pretend/functional play that supports social language development.
- Difficulty with nonliteral language, perspective‑taking, and adapting language to listeners.
- Continued atypical voice quality or rhythm; prosodic differences remain noticeable.
Cross‑Age Red Flags
- Communication primarily used to request rather than to share interest or emotion.
- Consistent lack of joint attention and shared referencing.
- Repetitive language (echolalia, scripting) or idiosyncratic phrases.
- Marked difficulty with imitation (gestural and vocal).
- Regression — loss of words, gestures, or social skills at any time.
When to Refer
- By 6 months: absent back‑and‑forth vocalizing or social smile.
- By 9-12 months: no canonical babbling, no gestures (pointing/showing), no response
to name. - By 15–18 months: minimal single words, poor joint attention.
- By 24 months: fewer than ~50 words or no two‑word combinations; any loss of previously
acquired skills. - Any persistent atypical vocal quality, prosody, or marked social‑communication concerns
should prompt SLP evaluation and multidisciplinary assessment.
Practical Suggestions for Caregivers and Providers
- Provide responsive, face‑to‑face interaction: follow the child’s lead, imitate their sounds,
and comment on their actions. - Model gestures (pointing, showing) and simple language paired with gestures.
- Use short turn‑taking routines (peek‑a‑boo, rolling a ball) to build reciprocity.
- Prioritize live social interaction over passive screen time.
- Request a developmental screening and early intervention referral when
red flags are present.
Red Door Pediatric Therapy’s SLP teams evaluate speech, language, and pragmatic skills and collaborate with pediatricians and developmental specialists for comprehensive assessment and treatment planning. If you’d like, we can produce an age‑based printable checklist or clinic handout for families.