Estimate a child's maintenance fluid requirements, assess hydration during illness, and learn when medical advice may be needed. This educational tool does not diagnose dehydration.
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Educational information about maintenance fluid requirements, dehydration signs, and when to seek medical advice.
Maintenance fluid requirement is an estimate of the amount of fluid normally needed to maintain hydration. It accounts for fluid lost through normal body processes such as breathing, sweating, and urine production. This estimate can guide how much a child should drink each day under typical conditions.
Children's fluid requirements depend largely on body weight. Heavier children generally require more fluid. The commonly used maintenance fluid formula provides an estimate based on the child's current weight, which is why an accurate weight measurement is helpful when using this calculator.
Fever, vomiting and diarrhoea may increase fluid losses. A child with fever loses additional fluid through sweating and increased respiratory rate. Vomiting and diarrhoea can cause significant additional fluid losses depending on their frequency and severity. Some children may require more fluid than the maintenance estimate shown by this calculator.
Reduced urine output may be an early sign of dehydration. When a child is not getting enough fluid, the body conserves water by producing less urine. Monitoring urine output can help identify children who may need medical assessment. If a child has not passed urine for several hours, this may indicate dehydration.
Common signs of dehydration in children include: dry mouth or tongue, reduced urine output, absence of tears when crying, lethargy or reduced activity, and reduced willingness to drink. More serious dehydration may cause sunken eyes, skin that does not spring back quickly when pinched, and marked lethargy. These findings require prompt medical assessment.
Not necessarily. The goal is to achieve an adequate total fluid intake over the course of the day. Many children tolerate small frequent drinks better than large volumes at once, particularly when they are unwell or vomiting. Offering small amounts regularly is often more effective than encouraging large single amounts of fluid.
Offer small amounts frequently. Waiting a few minutes after a vomiting episode before offering fluids again can sometimes help. Offering a teaspoon or two at a time, gradually increasing the amount as tolerated, is often better than offering a large drink at once. If most or all fluids are repeatedly vomited back, medical assessment is recommended.
Medical advice should be sought if dehydration is suspected, symptoms worsen, or warning signs are present. Young infants under 3 months should be assessed promptly with any illness. A child who is refusing all fluids, has no urine output, has persistent vomiting, or appears significantly unwell should be seen by a healthcare professional without delay.
The calculator uses a commonly used weight-based maintenance fluid formula. For children up to 10 kg, the estimate is 100 mL per kg per day. For children between 10 and 20 kg, an additional 50 mL per kg per day is added for each kg above 10. For children above 20 kg, a further 20 mL per kg per day is added for each kg above 20.
Yes. Fever may increase fluid losses and fluid requirements. Children with fever lose additional fluid through sweating and faster breathing. The calculator provides a baseline maintenance estimate; actual requirements may be higher when a child has a fever.
Yes. Loose stools can increase fluid loss and may require additional oral fluids. The amount of extra fluid needed depends on the frequency and volume of loose stools. This calculator provides age-specific guidance on additional fluids that may be offered after each loose stool.
Offer small amounts more frequently. Waiting a short time after a vomiting episode before offering fluids again may help. Giving a teaspoon or small sip at a time, gradually increasing as tolerated, is often better than offering a large drink. If most fluids are repeatedly vomited back, seek medical advice.
No. It provides educational guidance only. The hydration assessment in this tool is based on a simple scoring system and cannot replace clinical assessment by a healthcare professional. If you are concerned about dehydration, seek medical advice.
Dr. Seneth Gajasinghe
MBBS (Col), MD (Col)
SLMC No. 27329
Sineth Hospitals
Rattanapitiya, Boralasgamuwa, Sri Lanka
0 727 725 725 | info@sinethhospitals.com