Signs of dehydration

Reviewed 13 October 20262 min read

The signs that she is losing more fluid than she takes in, what to give her, and when dehydration is an emergency.

In short

  • Babies get dehydrated more easily than adults.
  • Fewer wet nappies can be a sign.
  • No wet nappy for 12 hours is an emergency.

What causes it

Dehydration means she loses more fluid than she takes in. Babies are more at risk. It happens more easily if she is being sick, has diarrhoea, has a high temperature or is too hot.

Signs to watch for

Watch her wet nappies. Fewer than usual can be a sign. The other signs are these, and the ones in the list at the end of this guide:

  • Her pee is dark yellow and strong smelling: call your doctor today
  • Her eyes look sunken: call your doctor today
  • She seems drowsy or irritable: call your doctor today

What to give her

  • Keep breastfeeding or giving formula.
  • Offer small amounts more often than usual.
  • Never make her formula weaker.
  • If she has formula or solid food, give small sips of water too. Under 6 months, boil the water and let it cool first.
  • Do not give fruit juice or fizzy drinks. They can make diarrhoea or sickness worse.

A pharmacist can suggest a rehydration solution. Ask your doctor or pharmacist before giving any medicine.

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