ADVERTISEMENT Whether babies take their first steps at nine or 15 months depends on a lot of factors – including their genes, a new study has found. New parents wait with bated breath for their babies to begin walking independently, which is an important early sign of child development. But the exact age that they start hinges on their size, whether they were born early, if they’ve had the chance to practice walking, and their nutrition, among other conditions. Now, the study indicates 11