How to Rehydrate My Baby
The short answer
The best way to rehydrate a sick baby is to offer breast milk, formula, or a commercial oral rehydration solution (like Pedialyte) in small, frequent amounts. For breastfed babies, nurse more often in shorter sessions. For formula-fed babies and toddlers, offer an oral rehydration solution in small sips every few minutes. Avoid giving plain water alone to babies under six months, juice, soda, or sports drinks, as these can worsen diarrhea.
By Age
What to expect by age
Breast milk and formula are the primary rehydration fluids for babies under six months. If your breastfed baby is vomiting, try nursing for shorter periods more frequently. For formula-fed babies, your pediatrician may recommend offering small amounts (one to two tablespoons) of oral rehydration solution between formula feeds. Do not dilute formula or give plain water to babies under six months without medical guidance, as this can cause dangerous electrolyte imbalances.
Continue breastfeeding or formula feeding as the primary source of hydration. You can now also offer small sips of water and oral rehydration solution between feeds. If your baby is vomiting, wait about 30 minutes after a vomiting episode, then offer one teaspoon of oral rehydration solution every two to three minutes. Gradually increase the amount as your baby tolerates it. A medicine syringe can help deliver small precise amounts.
Toddlers can drink oral rehydration solution from a cup or sippy cup. Offer small, frequent sips rather than large amounts at once. If your toddler refuses the rehydration solution, try offering it cold, as ice pops made from the solution, or mixed with a very small amount of juice for flavor. Continue offering normal foods as tolerated, as eating helps the gut recover. Avoid giving large amounts of apple juice or sugary drinks, which can worsen diarrhea.
Older toddlers may be more cooperative with drinking but may also have stronger preferences. Oral rehydration solution popsicles, small cups with straws, and gentle encouragement all help. Once vomiting has stopped for a few hours, gradually reintroduce a normal diet. Broth-based soups, crackers, and bland foods are good starting points. If your child continues to refuse all fluids, contact your pediatrician, as IV rehydration may be needed.
What Should You Do?
When to take action
- Your baby is taking small frequent sips of oral rehydration solution or breast milk and maintaining wet diapers during an illness
- Your baby vomits occasionally but is able to keep down small amounts of fluid between episodes
- Your toddler is drinking less than usual but is still producing wet diapers and gradually improving
- Your child's energy and mood improve after rehydration and they begin asking for food
- You are unsure how much fluid to offer your baby or which products are appropriate for their age
- Your baby has been sick for more than 24 hours and you want to confirm your rehydration approach is working
- Your baby cannot keep any fluids down for more than eight hours or is showing signs of worsening dehydration despite your rehydration efforts
- Your baby under three months is refusing to feed, your baby has bloody diarrhea or vomit, or your baby is extremely lethargic, has a sunken fontanelle, or has not had a wet diaper in more than six hours
Sources
Related Resources
Related Digestive Concerns
My Baby's Belly Looks Swollen
A rounded, slightly protruding belly is completely normal in babies and toddlers due to immature abdominal muscles and their proportionally larger organs. However, if the belly becomes suddenly swollen, feels hard and tight, or is accompanied by pain, vomiting, or changes in bowel movements, it needs medical evaluation as it could signal gas buildup, constipation, or rarely, something more serious.
My Baby Has an Anal Fissure (Blood When Pooping)
A small streak of bright red blood on the surface of your baby's stool or on the diaper is most commonly caused by an anal fissure, which is a tiny tear in the skin around the anus from passing hard stool. Anal fissures are very common in babies and toddlers and usually heal on their own with simple measures like keeping stools soft. While this is rarely serious, any blood in your baby's stool should be mentioned to your pediatrician.
My Baby Eats Non-Food Items (Pica)
It is completely normal for babies and young toddlers to explore by putting objects in their mouths. True pica, which is the persistent eating of non-food substances, is uncommon before age two and may be linked to iron deficiency or developmental factors. If your child repeatedly seeks out and eats non-food items past the typical mouthing stage, it is worth discussing with your pediatrician.
Baby Excessive Gas After Starting Solids
Increased gas after starting solid foods is completely normal and expected. Your baby's digestive system is encountering new proteins, fibers, and sugars for the first time and needs time to adapt. The gut bacteria are also diversifying, which naturally produces more gas. This typically improves within a few weeks as the digestive system adjusts to each new food.
My Baby Gulps Air While Feeding
Swallowing some air during feeding is normal for all babies, but excessive air gulping can lead to gas, hiccups, and spit-up. Common causes include fast milk flow, poor latch (if breastfeeding), bottle nipple flow that's too fast or slow, and crying before feeds. Simple adjustments to feeding position, pacing, and equipment can usually help reduce air intake significantly.
Baby Poop Color Changes with Solids
Dramatic changes in poop color after starting solids are completely normal and expected. What your baby eats directly affects stool color - carrots may turn poop orange, spinach makes it green, beets can make it reddish, and blueberries can turn it dark blue-black. As long as your baby is comfortable and the stool is not white, black (tarry), or bright red with blood, these color changes are harmless.