Fasting for babies and children: what the stop times mean

Why the stop times exist

During a general anaesthetic, the reflexes that normally protect the lungs, such as coughing, are switched off. If there is food or milk in the stomach, it can come back up into the throat and be breathed into the lungs, which ANZCA says can cause life-threatening breathing problems. The Royal Children’s Hospital names pneumonia as one of the serious complications.

That is the whole point of fasting: an empty stomach, not a hungry child. Going without for longer than needed does not add protection. ANZCA’s guideline says prolonged fasting should be avoided, and its patient information says keeping hydrated is especially important for children.

The times in ANZCA’s guideline

ANZCA’s guideline on preparing patients for anaesthesia (PG07) has a fasting appendix, last revised in June 2026. For healthy children up to 16 years old it recommends:

The guideline also says the meal should be light, and, for babies under 12 months, caps the formula or cow’s milk allowed up to 4 hours before at 200 mL or 20 mL per kilogram, whichever is smaller. These times may not suit a child at higher risk of reflux or vomiting, in which case the anaesthetist will give individual advice.

What counts as a clear drink

A clear fluid is one you can see through, with nothing floating in it and no milk. ANZCA’s guideline lists water, pulp-free clear fruit juice, clear cordial and clear carbohydrate drinks, and excludes anything containing milk, pulp, fibre or jelly. The Royal Children’s Hospital gives a similar list (water, clear apple juice with no pulp, electrolyte drinks and icy poles) and adds that orange juice, dairy and non-dairy milks, jelly, broth, coconut water and fizzy drinks are not clear liquids.

If you are unsure about a drink, water is always a clear fluid.

Why your hospital’s letter may say something else

Parents are often confused when two sources give different times. They are not careless; fasting advice has been updated recently, and hospitals adapt it to their own patients and theatre lists. Some real differences you may come across:

• The Royal Children’s Hospital lets children sip clear drinks when thirsty until a doctor or nurse says to stop, and stops all formula, including toddler formula, 4 hours before.
• ANZCA’s own patient page describes the same “sip til send” approach in one place and a stop time of 1 hour before surgery in another, and says children over 65 kg should follow the adult rules.
• The Australian Society of Anaesthetists’ children’s pamphlet (reviewed in 2024, before ANZCA’s latest revision) gives 6 hours for food and milk, 4 hours for breast milk and 2 hours for clear fluids, and notes that some anaesthetists allow sips of water up to an hour before.

Which one should you follow? The one in your child’s hospital letter, because it matches how that hospital runs its lists. If the letter is unclear, or gives times that seem very long for a small child, phone and ask. It is a reasonable question, and the answer may make the morning easier.

A worked example

Hospitals usually give clock times. If yours gives only an arrival time, ask what time the anaesthetic is expected, because that is what the stop times count back from. Suppose a two-year-old’s anaesthetic is expected at 1 pm, and the hospital follows ANZCA’s guideline:

1. 7 am: last light meal, and last formula or cow's milk (6 hours before)
2. 10 am: last breastfeed (3 hours before)
3. Until noon: small drinks of water or another clear fluid when thirsty (up to 1 hour before)
4. 1 pm: anaesthetic

This is an illustration only. Lists run early and late, and your hospital may use different times. If anything changes on the day, ask the nurse whether your child can have another drink.

Getting through the wait

• Plan the last feed or meal as close to its stop time as you can, rather than stopping at midnight out of habit.
• Keep offering clear drinks until the clear-fluid stop time. ANZCA’s guideline encourages them, rather than a long stretch with nothing at all.
• Keep food out of sight. No snacks in the car, and breakfast for brothers and sisters in another room.
• Bring distractions for the waiting room, and ask staff before giving anything to eat or drink there.
• For babies, bring formula or expressed milk for afterwards. The Royal Children’s Hospital says babies can start breastfeeding, or have formula or water, as soon as they are awake after day surgery.

If your child eats or drinks something by mistake

It happens: a biscuit from a sibling, a drink from the wrong cup. Tell the nurse or anaesthetist straight away, and be exact about what and when. ANZCA says the anaesthetic may need to be delayed by a few hours to let the stomach empty; The Royal Children’s Hospital says surgery may be delayed or rescheduled. Saying nothing is the only wrong answer.

In an emergency, call 000. This information is general and does not replace advice from your treating practitioner. Your child's anaesthetist, surgeon, dentist or hospital knows your child, and their instructions come first.