Which action contributes to a safe bathing environment for infants?

Ensuring that the water temperature is comfortable before bathing is crucial for creating a safe bathing environment for infants. Infants have sensitive skin and can easily be burned by water that is too hot, leading to serious injuries. Testing the water temperature with a thermometer or by placing your wrist in the water can help confirm that it is at a safe level, typically around 37-38 degrees Celsius (98.6-100.4 degrees Fahrenheit). This precaution helps to ensure that the infant's bathing experience is safe and pleasant, reducing the risk of discomfort or injury during the process.

While the other options may relate to the bathing process, they do not specifically address the direct safety of the water temperature, which is the most critical factor in preventing burns and ensuring a safe bathing environment. For instance, keeping the room temperature cool could lead to a child getting cold, while using pillows does not prevent accidents related to water temperature or the risk of slipping during bath time.