Water for babies: when to introduce it and how much
One of the questions new parents ask most often is whether their baby needs water on top of their milk feeds. The short answer depends on how your baby is fed and how old they are. This guide walks through what the NHS recommends for each stage of the first year, from birth through to 12 months.
Before 6 months: milk is enough
For the first six months of life, a baby's hydration needs are fully met by their milk, whether breast milk or formula. There is no stage during this period where extra water is routinely required.
- Breastfed babies do not need any water until they have started eating solid foods. Breast milk adjusts to meet a baby's fluid needs even in warm weather.
- Formula-fed babies under 6 months may occasionally need small sips of cooled boiled water during hot weather, in addition to their usual formula feeds. This is an exception rather than a daily routine.
If you are unsure whether your baby needs anything extra in hot conditions, speak with your health visitor. They can help you judge based on your baby's weight, feeding pattern, and the temperature at home.
From 6 months: introducing water alongside solids
The picture changes once your baby starts eating solid foods, which typically happens at around 6 months. At this point you can begin offering small sips of water from a cup or beaker at mealtimes. Water does not need to be boiled once your baby is past 6 months old, so ordinary tap water is fine.
Starting water alongside solid foods helps your baby get used to the taste and the act of drinking from a cup. There is no set target volume at this age. The goal is gentle familiarity rather than large quantities. Breast milk or first infant formula continues to be the main drink throughout the whole first year.
Choosing the right cup
The type of cup you introduce matters for your baby's development. The NHS advises starting cup drinking from around 6 months and recommends an open cup or a free-flow cup that does not have a valve. This style of cup encourages babies to sip rather than suck, which is better for their teeth and helps them learn the motor skills involved in drinking.
- Open cups (like a small plastic beaker with no lid) are a great starting point, even if they are messy at first.
- Free-flow cups have a lid with a spout but no valve, so liquid flows freely when tipped. These are also recommended.
- Valved or sealed sippy cups require the baby to suck rather than sip and are not the preferred option.
Once your baby reaches their first birthday, the NHS advises discouraging bottle use and moving fully to a cup for all drinks.
Drinks to avoid in the first year
Several drinks are not suitable for babies under 12 months. Breast milk or first infant formula should remain the primary source of nutrition and fluid. Everything on the list below should be kept away from babies in the first year:
- Fruit juice and smoothies contain natural sugars that can affect developing teeth.
- Squashes, flavoured milks, and fruit drinks often contain added sugars or sweeteners not appropriate at this age.
- Fizzy drinks and diet drinks including carbonated water.
- Slush ice drinks, which can cause a rapid drop in body temperature.
- Herbal drinks and herbal teas, which may contain ingredients unsuitable for infants.
- Tea and coffee, which contain caffeine and other compounds harmful to babies.
If fruit juice is given at all before 12 months, it should be heavily diluted at a ratio of one part juice to ten parts water, and only offered at mealtimes rather than sipped throughout the day. Even then, plain water remains the better choice.
A note on tap water and fluoride
In the UK, tap water is safe for babies from 6 months without boiling. It may contain fluoride, which plays a role in tooth development. If you have any concerns about the water quality in your area, your local water supplier can give you information about what is in the supply.
Watching for signs your baby is well hydrated
During the first months, milk provides all the hydration your baby needs, and a well-fed baby will show clear signs of this. Things to look for include:
- Pale or clear urine rather than dark yellow.
- Regular wet nappies throughout the day.
- Alert and responsive behaviour between feeds.
If your baby has noticeably fewer wet nappies than usual, seems lethargic, or you are concerned about dehydration for any reason, contact your health visitor, midwife or GP promptly.
Frequently asked questions
When can I give my baby water?
Breastfed babies do not need water at all until solid foods begin at around 6 months. Formula-fed babies under 6 months may be offered small sips of cooled boiled water during hot weather. Once solid foods start at around 6 months, you can offer sips of plain water at mealtimes in a cup or beaker.
Does water need to be boiled for babies?
For formula-fed babies under 6 months who may need a small amount of water in hot weather, the water should be cooled boiled water. For babies over 6 months who are eating solid foods, drinking water from the tap does not need to be boiled first.
What type of cup is best for a baby learning to drink water?
An open cup or a free-flow cup without a valve is the recommended choice from around 6 months. This style helps babies develop sipping skills and is better for their teeth than a valved beaker that requires sucking.
Can I give my baby fruit juice instead of water?
Fruit juice is not recommended as a drink for babies under 12 months. If it is given at all, NHS guidance says it should be diluted to one part juice and ten parts water, and only offered at mealtimes. Plain water is a far better alternative for thirst.
What drinks should babies under 12 months avoid?
Babies should not have fruit juice or smoothies, squashes, flavoured milks, fizzy or diet drinks, slush ice drinks, herbal drinks, tea, or coffee before their first birthday. Breast milk or first infant formula stays the main drink throughout the first year.
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