Checking the water temperature
Always check the temperature with your hand before bathing your baby. Aim for bath water around 100 F (38 C). To prevent scalding, set the thermostat on your water heater to below 120 F (49 C). Be sure the room is comfortably warm, too. A wet baby might be easily chilled.
A common recommendation is to fill the tub or sink with 2 inches (about 5 centimeters) of warm — not hot — water. To keep your baby warm, pour warm water over his or her body throughout the bath. Some research suggests that using slightly more water — enough to cover a baby's shoulders — can be calming and help reduce heat loss. With any amount of water, be sure to hold your baby securely.