Why is it important to introduce new foods to infants one at a time?

A) Infant digestive systems cannot handle combinations of different foods.
B) Introducing foods one at a time helps to isolate possible food allergies.
C) Infants may develop an aversion to foods that are combined with other foods.
D) Infants may develop an unhealthy appetite for combined foods.

Introducing new foods to infants one at a time is crucial for identifying any allergic reactions to specific foods. By isolating foods, parents and caregivers can more easily pinpoint which food may be causing an adverse reaction, such as a rash, gastrointestinal discomfort, or more severe allergic responses. This method does not imply that infants' digestive systems can't handle combinations of foods or that they will develop aversions or unhealthy appetites for combined foods; rather, it's a safety measure to monitor for allergies.