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Difficulty: MediumNormal Growth and Development

A medical student is preparing for a developmental pediatrics rotation and reviewing expected milestone acquisitions. Understanding the timeline of language development is critical for early identification of developmental delays. Arrange the following expressive language milestones in the typical chronological order in which they emerge in a healthy, neurotypical child, from earliest to latest.

  1. 1Making non-crying, musical vowel sounds (cooing)
  2. 2Producing repetitive consonant-vowel combinations (babbling)
  3. 3Using at least one specific word appropriately other than 'mama' or 'dada'
  4. 4Combining vocabulary into simple two-word phrases
  5. 5Speaking with 100% speech intelligibility to strangers

Answer

The correct chronological sequence of expressive language development is: cooing (2 months), babbling (6 months), first specific word other than mama/dada (12 months), two-word phrases (24 months), and 100% intelligibility to strangers (4 years).
Normal expressive language milestones follow a predictable, sequential pattern. The sequence begins with vowel sounds (cooing) at 2 months of age. This progresses to consonant-vowel repetitions (babbling) by 6 months. Around 12 months of age, children develop the ability to use specific words appropriately other than 'mama' and 'dada'. By 24 months, a child's vocabulary has grown to about 50 words, allowing them to form two-word phrases. Finally, articulation improves progressively such that a child's speech is 25% intelligible to strangers at age 1, 50% at age 2, 75% at age 3, and 100% at age 4 (48 months).

Step-by-Step Solution

1
Identify the expected age for cooing.
Cooing (vowel sounds) is identified as the earliest milestone, typically occurring at 2 months of age.
Before consonants are formed, young infants experiment with their vocal cords to make vowel sounds.
2
Identify the expected age for babbling.
Babbling (consonant-vowel combinations) typically occurs at 6 months of age.
As oral motor control improves, infants begin adding consonants to their vocalizations.
3
Identify the emergence of the first true word.
Using a specific word besides 'mama' or 'dada' occurs around 12 months of age.
At 1 year, children begin using words specifically and contextually to communicate intent.
4
Identify the age for two-word phrases.
Two-word phrases emerge at approximately 24 months (2 years) of age.
By age 2, vocabulary expands to about 50 words, and children begin combining them into simple phrases.
5
Identify the milestone of full speech intelligibility.
100% speech intelligibility to strangers is achieved by 48 months (4 years) of age.
Intelligibility follows a general rule: 25% at 1 year, 50% at 2 years, 75% at 3 years, and 100% at 4 years.

Key Concept

Normal Expressive Language Milestones
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Topics

Normal Growth and Development

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