Dry residue in water: which value should you choose?

When you become a parent, choosing which water to use for your baby’s bottle and feeds raises many questions. Tap water, bottled water, mineral water or spring water: all are safe to drink, but not all are suitable for infants.

One criterion often appears on labels: dry residue. This value, expressed in mg/L, is one of the key factors in understanding the composition of the water and choosing a water that is suitable for your baby’s age and needs.

It is normal for parents to sometimes feel overwhelmed by the wide variety of waters available. The information on labels is not always easy to interpret, especially when you want to make the best choice for your baby. However, learning to read this information helps build confidence and avoid common mistakes, such as using unsuitable water over the long term.

Choosing the right water is not just a matter of convenience or taste: it also plays a part in the overall balance of the baby’s diet. Suitable water helps ensure proper hydration without overloading the body with unnecessary minerals. This is why understanding criteria such as dry residue is essential for making an informed choice that is appropriate for the infant’s age.

Why the choice of water is important for babies’ health

In babies and infants, the body is still developing. Their kidneys are not yet fully developed and their fluid balance is more delicate than in adults.
Before the introduction of solid foods, a baby’s water intake comes mainly from:

• breast milk or infant formula,
• the water used to prepare bottles.

Water that is unsuitable can place an unnecessary strain on the body. This is why it is important to choose water that is suitable for infants’ health.

For infants, every little bit counts. A baby’s body is still developing, and certain organs, such as the kidneys, are not yet functioning at full capacity. Water that is too rich in minerals can therefore place an extra strain on the body, especially when used daily for bottle feeds.

This is also why health guidelines emphasise the importance of choosing water suitable for infant feeding. Carefully selected water ensures the baby’s physiological needs are met, whilst minimising the risks associated with an excess of minerals. Choosing the right water is therefore part of a comprehensive approach to preventing health issues and protecting the health of infants.

Tap water or bottled water: what do you need to know?

Tap water for babies

Tap water is safe to drink and is monitored. However, its quality can vary depending on the local authority, the water mains or local conditions. Some tap water may be higher in minerals or contain nitrate levels close to regulatory limits.

This is why, for infants, it is often recommended to check whether tap water is suitable or to opt for a specific type of bottled water.

Bottled water for infants

Bottled water intended for babies meets strict health and safety standards. When it is labelled ‘suitable for infant feeding’, it is suitable for regular consumption by babies.

Mineral water and spring water: what are the differences?

Natural mineral water

Mineral water has a stable mineral composition. Some varieties are highly mineralised and are generally intended for adults. Others, which are low in minerals, may be suitable for infants.

Spring water

Spring water may also be suitable for babies, provided it meets the regulatory criteria and is labelled as suitable for infant feeding.

👉 For parents, the most important thing is not the category, but the composition of the water.

What is the dry residue in water?

The dry residue is the total quantity of minerals present in the water after evaporation at 180 °C.
It includes, in particular:

• calcium,
• magnesium,
• sodium,
• bicarbonates,
• sulphates.

The label might state, for example:
Dry residue at 180 °C: X mg/L

👉 This value is used to assess the overall mineral content of the water.

Dry residue and mineral content: the link

The higher the dry residue, the higher the mineral content.
For infants, water with a low mineral content is recommended, as their mineral requirements are already met by milk.

Water that is too rich in minerals may be unnecessary, or even cause digestive discomfort.

Dry residue in water: is it dangerous for a baby?

Dry residue is not dangerous in itself. The risk arises mainly when water with a high mineral content is used regularly for an infant.

Unsuitable water can:

• increase the workload on the kidneys,
• disrupt fluid balance,
• provide too many minerals.

It is therefore a factor to consider when choosing water, not an indicator of immediate danger.

It is important to remember that dry residue should not be interpreted as an immediate warning sign. A high value does not indicate that the water is unfit for consumption, but rather that it is not necessarily suited to the specific needs of babies. In adults, mineral-rich water may even be sought after in certain contexts.

For infants, however, the aim is to limit unnecessary mineral intake. Occasional consumption of water with a higher mineral content poses no risk, but regular consumption may disrupt hydration or place an unnecessary strain on the kidneys. The dry residue should therefore be seen as a tool to aid choice, rather than as an alarming indicator.

What is the dry residue limit for water intended for infants?

For infant feeding, the following is generally recommended:

• water with a low mineral content,
• with a dry residue of less than 500 mg/L.

This limit is widely used to identify water that is suitable for babies’ needs

The order of magnitude of dry residue in water

• < 100 mg/L : very low mineral content
• 100 à 300 mg/L : low mineral content, suitable for babies
• 300 à 500 mg/L : acceptable under certain conditions
• > 500 mg/L : mineral-rich water, generally intended for adults

Ces repères permettent de choisir plus facilement en rayon.

Sodium and other minerals to watch out for

Among minerals, sodium deserves special attention. A high sodium content can disrupt fluid balance in infants.

Other minerals, such as sulphates, can also affect digestive comfort.

Low-mineral water: why it’s essential for babies

Water with a low mineral content is best suited to:

• the baby’s age,
• their physiological needs,
• and daily use in baby bottles.

It’s a reassuring choice for parents, especially during the first few months.

How to read the label on a bottle of baby water

On the label, it is important to check:

• whether it is suitable for infant feeding,
• the dry matter content,
• the overall composition,
• and the sodium and nitrate content.

These criteria enable you to make an informed choice.

Reading a label requires a little care, but a few simple steps are all it takes. In addition to the dry residue, the statement indicating that the water is suitable for infant feeding is a key indicator. It guarantees that the water meets specific quality and safety standards.

How to compare two types of water easily

To compare two types of water:

1. Check that they are suitable for infants
2. Compare the dry residue
3. Look at the main minerals

👉The lightest water is generally the most suitable.

Water and Hydration for Infants

Hydration plays a vital role in ensuring a baby’s body functions properly. The right kind of water helps maintain a healthy fluid balance, alongside milk.

At what age should you start paying attention to the choice of water?

From birth right through to the introduction of solid foods, the choice of water is particularly important. Even afterwards, it remains advisable to opt for water suitable for young children.

General recommendations for parents

• Choose water suitable for infants’ diets
• Opt for water with a low mineral content
• Avoid water that is too rich in minerals
• Read the labels carefully

These recommendations help to protect babies’ health.

Dry residue and baby water: key points to remember

• The dry residue indicates the mineral content of the water
• For babies, water with a low mineral content is preferable
• The reference threshold is < 500 mg/L
• This is a simple criterion for choosing water