A 4-year-old boy is brought to the physician because of non-fluent speech. His mother worries that his vocabulary is limited for his age and because he cannot use simple sentences to communicate. She says he enjoys playing with his peers and parents, but he has always lagged behind in his speaking and communication. His speech is frequently not understood by strangers. He physically appears normal. His height and weight are within the normal range for his age. He responds to his name, makes eye contact, and enjoys the company of his mother. Which of the following is the most appropriate next step in management?

Evaluate response to methylphenidate

A 2-month-old is brought to the physician for a well-child examination. She was born at 39 weeks gestation via spontaneous vaginal delivery and is exclusively breastfed. She weighed 3,400 g (7 lb 8 oz) at birth. At the physician's office, she appears well. Her pulse is 136/min, the respirations are 41/min, and the blood pressure is 82/45 mm Hg. She weighs 5,200 g (11 lb 8 oz) and measures 57.5 cm (22.6 in) in length. The remainder of the physical examination is normal. Which of the following developmental milestones has this patient most likely met?

Absence of asymmetric tonic neck reflex

A male child is presented at the pediatric clinic for a well-child visit by his mother who reports previously normal developmental milestones. The child was born at 40 weeks with no complications during pregnancy or birth. The mother notes that the infant is able to sit without support. He is able to feed himself crackers and pureed food. He is constantly shaking his toy teddy bear but is able to stop when the mother says 'no'. Which of the following indicate the most likely language milestone the child presents with?

Saying words such as apple and cat, though limited to around 4 different words

Able to say his first and last name

A 13-month-old girl is brought to the physician for a well-child examination. She was born at 38 weeks' gestation. There is no family history of any serious illnesses. She cannot pull herself to stand from a sitting position. She can pick an object between her thumb and index finger but cannot drink from a cup or feed herself using a spoon. She comes when called by name and is willing to play with a ball. She cries if she does not see her parents in the same room as her. She coos “ma” and “ba.” She is at the 50th percentile for height and weight. Physical examination including neurologic examination shows no abnormalities. Which of the following is the most appropriate assessment of her development?

Fine motor: normal | Gross motor: delayed | Language: delayed | Social skills: normal

Fine motor: normal | Gross motor: delayed | Language: normal | Social skills: delayed

Fine motor: delayed | Gross motor: normal | Language: delayed | Social skills: normal

Fine motor: delayed | Gross motor: delayed | Language: normal | Social skills: normal

Fine motor: delayed | Gross motor: normal | Language: normal | Social skills: delayed

A 3-year-old girl is brought to the physician for a well-child examination. She was born at term and has been healthy since. She can climb up and down the stairs and can pedal a tricycle. She has difficulty using a spoon to feed herself but can copy a line. She speaks in 2- to 3-word sentences that can be understood by most people. She is selfish while playing with children her age and throws tantrums quite often. She cannot put on her own shoes and socks. She does not tolerate separation from her parents. She is at 60th percentile for height and weight. Physical examination including neurologic examination reveals no abnormalities. Which of the following is the most appropriate assessment of her development?

Fine motor: Delayed | Gross motor: Normal | Language: Normal | Social skills: Delayed

Fine motor: Normal | Gross motor: Normal | Language: Delayed | Social skills: Delayed

Fine motor: Delayed | Gross motor: Delayed | Language: Normal | Social skills: Normal

Fine motor: Normal | Gross motor: Delayed | Language: Normal | Social skills: Delayed

Fine motor: Normal | Gross motor: Delayed | Language: Delayed | Social skills: Normal

A 1-year-old male presents to his pediatrician for a well-child visit. Through a history from the mother and physical examination, the pediatrician learns that the baby babbles non-specifically, takes several steps independently, and picks up his cereal using two fingers. His weight is currently 22 lbs (birth-weight 6 lbs, 9 oz), and his height is 30 inches (birth length 18 inches). Are there any aspects of this child's development that are delayed?

There are no developmental concerns

Language development for USMLE Step 2 CK: High-Yield Pediatrics Lessons

Language Milestones - The Chatter Timeline

Speech & Language Milestones Birth-5

Age	Receptive (Understands)	Expressive (Speaks)
2 mo	Alerts to sound	Cooing, social smile
4 mo	Orients to voice	Laughs, squeals
6 months	Orients to name/sound	Monosyllabic babble ("ba")
9 months	Understands "no"	Polysyllabic babble ("mama")
1 year	Follows 1-step command	1-2 words with meaning
18 months	Points to familiar objects	8-10 word vocabulary
2 years	Follows 2-step commands	2-3 word sentences (~50 words)
3 years	Follows 3-step commands	Tells stories (~250 words)
4 years	Knows colors, prepositions	100% intelligible speech

📌 Mnemonic: At 1, 2, and 3 years, a child uses 1, 2, and 3 words in a sentence, respectively.

Red Flags & Referral - Code Red Chatter

Immediate referral is crucial if a child exhibits any of the following:
- No response to sound or vocalizing by 6 months.
- No babbling by 12 months.
- No single, meaningful words by 16 months.
- No spontaneous, two-word phrases by 24 months.
- Stuttering that persists for >6 months.
- Any loss (regression) of speech or social skills at any age.

⭐ Absence of babbling by 12 months or single words by 16 months is a critical red flag requiring immediate evaluation.

Language Disorders - Tangled Tongues

Disorder	Key Features	Prognosis
Expressive	Difficulty producing speech, limited vocabulary, grammatical errors. Normal comprehension.	Generally good with therapy.
Receptive	Difficulty understanding spoken/written language. May seem inattentive.	More guarded; associated with learning disabilities.
Mixed	Combination of expressive and receptive deficits. Most severe form.	Poorest prognosis; significant functional impairment.
SLI	Language delay is the only developmental issue. Normal IQ & hearing.	Variable; may persist as learning disability.

Cooing appears at 3 months; the infant starts laughing at 4 months.

Monosyllables (da, pa) emerge at 6 months; responds to their own name.

Bisyllables (dada, mama) without meaning start at 9 months.

2-word sentences and a vocabulary of ~50 words by 2 years.

3-word sentences and knows full name & gender by 3 years.

Can tell a story and asks the meaning of words by 4-5 years.

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