Parents of newborns have received a clear warning – do not give water to their drinking water, as this could result in death.
Although water seems completely harmless, the smallest amount of water can affect the water balance in a baby's body.
Sucking in a baby under six months of age can overload your kidneys, which can lead to a dangerous condition known as hyponatremia.
Apothecary Abbas Kanani told Yahoo UK: "Kidneys are too immature even in infants under the age of six, and water can lead to intoxication due to an imbalance in electrolytes like sodium.
"This can lead to hyponatremia, in which too much water has diluted the sodium level in the body.
"This can lead to complications such as brain swelling, seizures and, in extreme cases, death."
Kanani added, "If a child is given water, it may affect the baby's ability to receive adequate nutrition.
"Their stomachs are so small and can easily fill with water, which makes it difficult for them to get the food they need."
By the age of at least six months, most experts believe that they should only receive breastmilk or food.
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Katie Zeratsky, a dietician at Mayo Clinic, told Buzzfeed, "Water poisoning will consume too much water in a short amount of time, and your blood levels of sodium will drop.
"In the adult world, you need to push your thirst and regulation so far that you almost have to force yourself to take it.
"For a baby, in most cases, they would be too full to do so, so it would be harder to do that in a baby, but it's not impossible."