The short answer
Plain water is an everyday drink at 25–30 months, but there is no single exact amount of drinking water that fits every child. Needs vary with heat, activity, milk and other fluids, water in food, and health. Offer water regularly rather than forcing a fixed volume.
In this guide · 11 sections
Keep in mind
- Offer water regularly and make it easy to ask for or reach.
- Milk and water-rich foods also contribute to hydration; drinking water is not the whole picture.
- Heat, active play, fever, vomiting, and diarrhea can change fluid needs.
- Seek advice for markedly less urine, signs of dehydration, or unusual ongoing thirst.
Is there one exact daily water target?
No single milliliter target for plain drinking water is right for every child of this age.
Fluid comes from water, milk and other suitable drinks; food also contains water.
Consider the whole day’s intake and your child’s condition rather than treating a cup count as a quota they must finish.
When can you offer water?
Keep drinking water available across the day, with a cup your child can use safely.
Offer it at meals and snacks and after active play, without waiting for a strong request.
As your child learns to say they are thirsty, respond to those requests and keep offering opportunities to drink.
Do weather and activity change fluid needs?
Yes. Hot conditions and physical activity can increase the need for fluids.
After running around or spending time at the park in warm weather, your child may want water more often.
Adapt the opportunities to drink to the day’s conditions rather than relying only on a fixed amount.
Does milk replace water?
Milk contributes fluid, but it should not be the only drink offered.
Keep plain water as a regular option throughout the day.
Consider milk and other dairy foods as part of nutrition too, so that frequent milk drinks do not crowd out food.
Are juice or sugary drinks needed?
No. Juice and sweetened drinks are not needed to meet daily fluid needs.
NHS guidance supports water as a regular drink for young children, alongside suitable milk.
Keep sweet drinks out of the everyday routine rather than using them to persuade your child to drink.
What changes during illness?
Fever, vomiting, or diarrhea can alter fluid needs and increase losses.
An ordinary water routine may not be enough: ask a health professional about oral rehydration solution when vomiting or diarrhea causes fluid loss, rather than relying on plain water alone.
Watch urine output, mouth dryness, alertness, and whether your child can keep fluids down.
When should you seek help?
For much less urine, unusual drowsiness, or other concerning signs of dehydration, seek an urgent GP appointment or call NHS 111. Call 999 if your child is hard to wake or has difficulty breathing.
Unusual persistent thirst, especially with more urination, weight loss, or tiredness, needs urgent medical assessment rather than being put down to warm weather.
If illness, vomiting, or diarrhoea prevents adequate drinking, seek urgent advice from your GP or NHS 111; do not wait to reach a daily water target.
What can you try today?
Keep a suitable cup of water easy to offer throughout the day.
Offer water with meals and snacks and after active play.
Create extra drinking opportunities on hot or busy days.
Notice thirst, urine output, and overall wellbeing together instead of focusing on one number.
When to seek support
Some signs need emergency help; other concerns can be discussed with your child’s healthcare team.
- Much less urine or concerning signs of dehydration: seek an urgent GP appointment or call NHS 111.
- Difficulty waking or breathing: call 999.
- Unusual ongoing thirst, particularly with frequent urination, tiredness, or weight loss: seek urgent assessment.
- Unable to drink enough or keep fluids down during vomiting, diarrhoea, or illness: seek urgent advice.
Sources used for this guide
- Centers for Disease Control and Prevention (CDC) — CDC – Foods and Drinks to Encourage – 1 Nisan 2026
- American Academy of Pediatrics / HealthyChildren.org — HealthyChildren – Recommended Drinks for Children Age 5 & Younger
- NHS — Drinks and cups for babies and young children
- NHS — Dehydration
- www.nhs.uk — regional guidance
English editorial review:
The English text and regional guidance have been checked editorially. This is not an individual clinical assessment.
Luluna provides general parenting information. It does not diagnose conditions or replace your child’s healthcare professional.
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