Baby bath thermometer
Shows the water temperature at a glance.
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Baby bath temperature: how warm should the water be? (°F and °C, how to check, and how deep)
Too hot and you worry about burns; too cool and your baby cries and shivers. Many parents test the water with a hand and still aren't sure. So what is the right baby bath temperature?
This guide gives a simple target in °F and °C, easy ways to check it, how deep the water should be, and the safety habits that matter. We are a family in Japan with two boys, and we share what has worked in our bathroom.
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The answer: warm, around 100°F (37-38°C)
A common guide for baby bath water is about 100°F, which is roughly 37-38°C - warm, not hot. Pediatric guidance also suggests setting your home water heater no higher than 120°F (49°C) to lower the risk of scalds.
Always mix the water first, then check it, then put baby in. Never add hot water while your baby is in the tub.
How to check the water
Use a bath thermometer: the easiest way to know for sure. Floating thermometers and digital ones are both simple to use.
If you don't have one, test with your elbow or the inside of your wrist - more sensitive than your hand. It should feel warm, never hot.
Swirl the water well before checking, so there are no hot spots.
Floating duck bath thermometer
A thermometer that doubles as a bath toy.
Baby tub with temperature indicator
Some tubs show when the water is too hot.
How deep should the water be?
For infants, a few inches of water is enough - many pediatric sources suggest about 2 inches (5 cm). Keep a hand on your baby the whole time, and pour warm water over their body so they don't get cold.
Keep the room warm too
A chilly bathroom makes baths miserable. Warm the room before you start, keep baths short, and have a hooded towel ready to wrap baby the moment they come out.
Hooded baby towel
Wrap baby head to toe right after the bath.
Safety notes
Never leave your baby alone in the bath, even for a moment, and keep everything you need within reach before you start.
If your baby's skin turns red after the bath or they seem unwell, cool down the water next time and ask your pediatrician if you're worried.
The takeaway
Aim for warm, around 100°F (37-38°C), check with a thermometer or your elbow, keep the water shallow and the room warm - and stay right there the whole time.
Turn bath time into a little adventure
Yukemuri Quest is a kids’ app: say "Let’s go!" before the bath, and after putting on pajamas, finish and meet a new friend.
See bath goods by problem →