Hydration is judged by drinking, urine, mouth, tears, alertness and circulation—not by stool count alone.
Do not wait for WhatsApp or a routine appointment.
Call an ambulance now if the child is difficult to wake, confused, blue, grey, very pale or blotchy, breathing abnormally, unable to drink safely, or appears to be getting rapidly worse.
If 108 or 102 does not connect, call India’s unified emergency number 112. Do not leave the child alone.
Look at input, output and behaviour
Early dehydration may appear as thirst, a dry mouth, fewer tears and less frequent urine. Increasing concern comes with very little urine, sunken eyes, cold or mottled hands and feet, fast breathing, marked weakness, unusual sleepiness or inability to drink. Babies can deteriorate faster and wet-nappy counts are useful.
Count vomiting and loose stools, but also record what fluid stays down and when the child last passed urine. A child who remains alert and takes small frequent amounts has a different risk from one who vomits every sip or cannot swallow safely.
Use oral rehydration deliberately
Oral rehydration solution is designed with a balance of water, salts and glucose. Give small frequent sips when the child is awake and swallowing normally, increasing as tolerated. Continue breastfeeding. Large drinks taken quickly may trigger more vomiting.
Plain water alone may not replace losses during significant diarrhoea, and very sugary drinks can worsen stool output. Do not give anti-diarrhoeal or anti-vomiting medicine to a child unless it has been specifically advised for that child.
Symptoms that suggest more than routine gastroenteritis
Green vomit, blood in vomit or stool, a swollen abdomen, severe localised pain, neck stiffness, head injury, poisoning concern or repeated vomiting without diarrhoea changes the assessment. Persistent diarrhoea, weight loss, recurrent episodes or recent travel may need a different investigation plan.
A clinician may assess circulation, weight change, glucose and the likely cause. Intravenous fluid is not automatically better; it is used when oral replacement is unsafe or insufficient.
Start with the pattern
Abdominal pain, constipation, diarrhoea and vomiting are broad symptoms. Duration, stool pattern, hydration, growth, diet, pain location, fever and associated symptoms determine what they mean.
Diarrhoea is often about hydration first
The immediate risk in many acute diarrhoeal illnesses is fluid loss. Parents need to know whether the child is drinking, urinating and remaining reasonably active.
Persistent symptoms need a different lens
Poor weight gain, blood in stool, recurrent severe pain, persistent vomiting or other concerning features can change the evaluation.
Common questions from parents
How do I know if my child is dehydrated?
Short answer: Think about intake, urine output, behaviour and ongoing fluid loss rather than one sign in isolation.
A child with vomiting or diarrhoea who is drinking, urinating and reasonably active is different from a child who cannot keep fluids down, urinates very little and becomes unusually sleepy or weak.
Dry mouth, reduced tears and other signs can contribute to the assessment, but severity is best judged clinically when there is concern.
Significant dehydration requires medical assessment; a seriously unwell child should not be managed through website advice alone.
What to record during rehydration
Use a simple running record: each vomit or loose stool, approximate fluid taken, breastfeeding, urine time, alertness and any medicine. This helps caregivers share the same picture and lets a clinician estimate whether losses are exceeding replacement. For babies, record wet nappies rather than relying on whether the mouth looks dry.
After each small amount of oral rehydration stays down, continue steadily rather than giving one large drink. Resume age-appropriate food as tolerated; prolonged fasting does not speed recovery. If intake repeatedly fails, urine falls further or the child becomes less interactive, stop home observation and seek assessment.
Clean hands, safe drinking water and careful food preparation reduce spread within the household. Use separate towels where practical and clean contaminated surfaces. Keep the child away from school or food preparation according to local public-health advice, especially while vomiting or diarrhoea is active.
Go to emergency care now if the child is difficult to wake, cannot drink safely, has very little urine, cold or mottled skin, green vomit, blood, severe abdominal pain or rapidly worsening weakness. Call an ambulance for collapse or abnormal breathing.
Sources and scope
These sources support the general principles in this guide. Guidance cannot account for an individual child’s age, examination, medical history or local clinical circumstances.