What will quench a baby's thirst?
Hydration plays a vital role in your baby's growth, energy, and overall well-being. As a parent, knowing if and how much your baby is thirsty can feel like a big responsibility, especially as their needs change at different developmental stages. Whether you are breastfeeding, formula feeding, or starting to introduce solid foods, this guide will help you confidently meet your baby's hydration needs.
Body fluid requirements
Our bodies are primarily made up of water, and even the smallest of us lose fluids throughout the day through urine, tears, breathing, and more. It is essential to replace these fluids, especially for babies whose systems are still developing.
Here are some general guidelines:
For the first 10 kg of body weight: 100 ml of fluid per kg per day
For each additional kg: 50 ml per kg per day
These figures provide a baseline, but your baby may be thirstier in hot weather, with a fever, during physical activity, or if unwell. Remember that hydration does not only come from water. Soups, fruits, vegetables, yogurts, and even cereals contribute to daily fluid intake.
How much should a baby drink?
Breastfed infants
According to the World Health Organization (WHO) and other health authorities, exclusively breastfed babies do not need additional liquids until six months of age. Breast milk is perfectly designed to meet both hunger and thirst needs. The first milk (foremilk) quenches thirst, while the second milk (hindmilk) satisfies hunger.
In hot weather or when sick, your baby may want to feed more frequently, which is completely natural. If additional hydration is needed, offering small amounts of cooled boiled water in a cup is a gentle option, but always consult your pediatrician.
Fluid intake for formula-fed babies
Formula-fed babies are nourished and hydrated by formula, which remains their primary drink until at least four to six months of age. However, as formula is thicker than breast milk, some babies may be thirstier, especially in hot weather or after feeding.
Never dilute formula or change mixing ratios to increase water intake. Instead, if your baby seems thirsty between feeds, you can offer small amounts of cooled boiled water. This ensures hydration while maintaining proper nutrition.
Beware of the risk of dehydration
Babies cannot tell us when they are thirsty, so it is important to recognise the signs of dehydration. Contact a healthcare professional if you notice any of the following signs:
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Dry or cracked lips
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Fewer wet nappies or a noticeable decrease in urine
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Dark yellow urine with a strong smell
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Sunken soft spot (fontanelle) on the child's head
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Dry or less elastic skin
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Lethargy, drowsiness, or fainting
Early detection and prompt treatment are essential to ensure your baby's safety and comfort.
Prefer water
When your baby is ready to start drinking water, generally around six months of age, plain water is the ideal choice. It is simple, natural, and free of anything your baby does not need.
Benefits of water for babies and young children:
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Effectively quenches thirst without added sugars
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Promotes good digestion and temperature regulation
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Helps prevent constipation
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Does not affect appetite or interfere with nutrient absorption
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Enables healthy drinking habits throughout life
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Encourages cup use
Start with boiled and cooled spring water, and offer it in an open cup or a baby-friendly training cup to ease the transition.
Juices
Juices can be introduced in moderation, but they should never replace water or milk as the primary source of hydration. Here's when it's generally safe to start:
Breastfed babies: after 6 months of age
Formula-fed babies: from around 5 months of age
When introducing juice to your baby, start gently and intentionally. Choose 100% natural, single-ingredient juices like apple or pear, as these are easier for your baby to digest and make it easier to identify any potential sensitivities. Always dilute juice with water to reduce its natural sugar concentration, making it more suitable for young stomachs. Start with small amounts, and it's also best to offer juice in a cup rather than a bottle, as this helps to avoid prolonged tooth exposure to sugars and encourages healthy drinking habits from the outset.
Juice should be a complement to a healthy diet, not an everyday staple.
Eva Kool
With 15 years of experience as a maternity nurse and a mother of three, I am truly passionate about the world of babies and baby care. At Difrax LOVI, I support professionals and specialized stores as a trainer and consultant, while also assisting the sales & marketing team. My goal is to share my expertise and provide parents with reliable and reassuring information for their baby's well-being.