A 24-month-old boy is brought to the clinic for developmental assessment. His mother reports he climbs stairs with support, kicks a ball, and points to familiar objects when named. All of the following are expected developmental achievements at 24 months EXCEPT:

## Developmental Milestones at 24 Months (2 Years) ### Language & Cognitive Milestones at 24 Months **Key Point:** By 24 months, toddlers typically have a vocabulary of 50+ words and can form 2–3 word phrases (e.g., "more milk", "mommy up"). They understand simple instructions and follow 2-step commands. ### Gross Motor Milestones at 24 Months **High-Yield:** The 24-month-old demonstrates: - Running (though often unsteadily) - Jumping with both feet off the ground - Kicking a ball (already noted in the vignette) - Standing on one foot briefly (1–2 seconds) - Climbing stairs with support (already noted in the vignette) ### Fine Motor & Adaptive Milestones at 24 Months **Key Point:** Fine motor skills include: - Copying a vertical line (horizontal lines come later at 3 years) - Turning pages of a book (2–3 pages at a time) - Scribbling spontaneously - Building a tower of 6–7 blocks ### Toilet Training: Timeline & Readiness **Warning:** Toilet training is NOT an expected achievement at 24 months. Daytime dryness and toilet training readiness typically emerge between 2.5–3 years of age. Attempting toilet training before 24 months or expecting completion by 24 months is developmentally inappropriate. **Mnemonic: Toilet Training Readiness (3 Ds)** - **Desire:** Child shows interest in using the toilet - **Dryness:** Daytime dryness for 2+ hours; staying dry during naps - **Development:** Ability to follow instructions, communicate needs, sit still **Clinical Pearl:** Toilet training typically begins between 2.5–3 years and is completed (daytime) by 3–4 years. Nighttime dryness may not be achieved until 5–6 years. Pushing toilet training too early increases stress and may lead to resistance or regression. ### Summary Table: 24-Month Milestones | Domain | Milestone | Achieved by 24 mo? | | --- | --- | --- | | Language | 50+ words, 2–3 word phrases | ✓ Yes | | Gross Motor | Running, jumping, standing on one foot | ✓ Yes | | Fine Motor | Copying vertical line, turning pages | ✓ Yes | | Adaptive | Toilet training completion | ✗ NO (2.5–3+ years) |