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A
6-9 months
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B
12-15 months — walking alone (supported) often begins around 9-12 months; independent walking (without support) by 12-15 months is typical; not walking by 18 months warrants evaluation
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C
18-24 months
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D
24-30 months
Why this is the answer
GROSS MOTOR MILESTONES for walking: SITTING independently: 6-8 months; PULLING TO STAND: 8-10 months; CRUISING (walking while holding furniture): 9-12 months; STANDING ALONE briefly: 10-12 months; FIRST INDEPENDENT STEPS: 9-12 months (range); WALKING WELL: 12-15 months (most children); RED FLAG: Not walking by 18 months requires developmental evaluation. DENVER DEVELOPMENTAL SCREENING covers motor, language, personal-social, and fine motor milestones. NCLEX APPLICATION: Nurses assess developmental milestones at well-child visits; anticipatory guidance helps parents know what to expect; referral when milestones are significantly delayed. Remember the milestones vary — some children walk at 9 months, others at 15 months — the 18-month threshold is the concern threshold, not a pathology diagnosis.
Source: NCLEX-PN, Gross Motor Milestones, Walking