Final answer:
To convert the length of the baby from inches to centimeters, you can use the conversion factor of 1 inch = 2.54 centimeters. Multiplying the length of the baby in inches (21 inches) by this conversion factor gives an approximate length of 53.34 centimeters.
Step-by-step explanation:
To convert inches to centimeters, you can use the following conversion factor: 1 inch = 2.54 centimeters. To calculate the length of the baby in centimeters, multiply the length in inches (21 inches) by the conversion factor:
21 inches * 2.54 centimeters/inch = 53.34 centimeters
So, the baby is approximately 53.34 centimeters long.