This is an English rendering of a Polish public-health reference. The care paths it names (112, night and holiday care NiŚOZ, primary care POZ) are Polish. This is not medical advice.

This is not medical advice Life-threatening emergency (Poland): 112

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Development and developmental leaps

8 questions

Questions are grouped by the age from which they apply to a child. Each one shows its full age range.

From birth3

How does a baby develop in the first three months of life, week by week?A child's development does not follow a strict pattern.0–3 mo.
How should a baby develop month by month, and what are the developmental milestones?A child's development does not follow a strict pattern.0–12 mo.
How can you recognize delayed or abnormal development in an infant?In the WHO study, sitting without support appeared between 3.8 and 9.2 months, and walking alone between 8.2 and 17.6 months (1st–99th percentile of healthy children).0–18 mo.

From months 4–64

From months 7–121

At what age does a child take first steps on their own?In the WHO study, the 1st–99th percentile of the age of walking alone was between 8.2 and 17.6 months, and this window was described as normal variation among healthy children.9–18 mo.