7. Over several months, the weight of a baby measured in pounds doubles. Does its
   weight measured in kilograms also double? Explain.
   (From Unit 3, Lesson 4.)

When the weight of a baby measured in pounds doubles, it does not simply follow that its weight in kilograms also doubles, due to the conversion factor between pounds and kilograms. One pound is equivalent to approximately 0.453592 kilograms. So when the baby’s weight in pounds doubles, you would convert that final weight to kilograms to see the new figure. For example, if the baby weighed 10 pounds (about 4.54 kg), doubling it would make it 20 pounds (about 9.07 kg), which is not double the original kilogram weight.

This concept is a fun reminder of how measurements work differently based on the units used! The mathematical relationship is linear, but conversion factors keep things interesting. Understanding unit conversions can help avoid misconceptions not only in weight but also in other measurements, leading to precise conclusions in real-world calculations, such as nutrition or growth tracking for infants.