Child Vomiting at Night: Causes and When to Get Help

Half past one. A retching sound from the bedroom, then crying, then bedding, pyjamas and the favourite soft toy — all of it, in one go. And while you are still feeling for the light switch, the question is already running in the back of your mind.

Here is the short version: most night-time vomiting is short-lived, and in children it usually stops within 1 or 2 days. What actually matters is fluid. Which warning signs count, what to do over the next few hours and when to pick up the phone — section by section below.

Why is my child being sick at night?

Usually because something ordinary has upset a small stomach. Vomiting in children is commonly caused by a tummy bug, but also by reflux in babies. Other causes are infections such as a urinary tract infection, motion sickness, inner ear infections or medicines your child is taking. At night it simply lands harder, without warning and without context.

The same episode at four in the afternoon would probably be filed under "ate too much, too fast". At two in the morning it comes with a dark room and a soaked duvet, which makes it feel worse than it usually is.

What changes the picture is what comes with it. Diarrhoea alongside the vomiting points towards a tummy bug, and those are the nights where fluid becomes the whole job. Vomiting is normally over within 1 or 2 days.

Worth noting for later: a single night is different from a pattern. If your child is repeatedly sick at night, or first thing in the morning before eating, raise it with your GP. That is not something to keep filing under bad luck.

Which warning signs need help straight away?

It is the accompanying signs that decide. Blood in the vomit, vomit like ground coffee, green vomit in a child, or a sudden severe tummy ache all mean 999 or A&E. Do not wait for the surgery to open. The same goes for vomiting after a bang to the head.

Below that threshold sits a second group. If your child keeps being sick and cannot keep fluid down, get advice from NHS 111 or your GP the same day. The same applies if the vomiting is not settling after a couple of days.

Dehydration counts too. In a child under 5, watch for fewer wet nappies than usual. In an older child, look for dark, smelly pee or peeing less often. And a baby who keeps being sick needs urgent advice from NHS 111 or your GP straight away, and 999 if they seem seriously unwell.

If none of that applies and your child is responsive between episodes, takes small sips and settles back to sleep, then the night is exhausting but not an emergency. From here it is mostly about fluid and rest.

What should you actually do in the middle of the night?

Sit them up first, then think about drinking. Keep your child upright while they are being sick so nothing goes the wrong way. Let them rinse their mouth afterwards, and only then deal with the bedding. Fluid comes next: small sips at short intervals rather than a full cup a queasy stomach will simply send back.

The first few minutes

Calm does most of the work here. Hold them upright, wipe their face, offer a sip to rinse with. The pyjamas and the duvet can wait five minutes. A spare fitted sheet within reach saves a surprising amount of energy if there is a second round.

Then: fluids, in small amounts

Give lots of fluids, such as water or squash, and take it in small sips. Volume is not the goal — frequency is. For babies who are being sick, try giving small feeds more often than usual, and carry on breast or bottle feeding as you normally would.

If your child cannot keep anything down at all over several hours, that is the point to call NHS 111 rather than keep experimenting. Our guide on a tummy bug and fluids walks through what to try, and in what order.

How do you know your child is running short on fluids?

Watch the nappies and the loo. In a child under 5, fewer wet nappies than usual is the clearest early sign of dehydration. In a child over 5, look for dark, smelly pee or peeing less often than usual. Add drowsiness or a child who cannot keep any fluid down, and it is time to call.

The younger the child, the faster this develops and the less room you have to wait and see. A baby who is repeatedly sick within a short space of time needs advice the same night, not a wait until the morning surgery opens.

Older children give you a little more margin, but the same signs apply. If your child keeps being sick and cannot keep fluid down, call NHS 111. If a tummy bug is behind it, our article on norovirus and dehydration in children covers the drinking strategy in detail.

How do you keep track of a night like this?

Four things decide how the next day is judged. When your child was sick, how often, how much they drank in between, and whether a temperature, diarrhoea or tummy pain joined in. After the third episode at four in the morning, all of that reliably blurs together.

The notepad on the bedside table rarely survives a night like this. It ends up under the bed or in the wash with the sheets. In Mona you log each episode with a timestamp and every drink in seconds, even half asleep in a dark room. By morning you have the actual sequence instead of a rough impression.

It pays off at the appointment. Your GP will ask a few things. When did it start, how often in the last few hours, was there a temperature or diarrhoea, and did anything stay down? Those answers are already in your log — including whether the vomiting keeps happening at night or first thing in the morning.

Is night-time sickness in a baby just reflux?

In babies, that is a genuinely likely explanation. Reflux is when a baby brings feeds back up — the "spitting up" most parents recognise. The NHS lists it among the common causes of vomiting. It tends to show up in the first months of life, usually after a feed rather than out of nowhere.

The pattern is different from a tummy bug. Reflux looks like small amounts brought back up after feeding, often with unsettled crying, rather than the sudden, forceful vomiting of an infection. It also does not come with diarrhoea.

If your baby is repeatedly unsettled at night and bringing feeds back up, talk to your health visitor or GP rather than changing feeds on your own. If feeding has become a battle more generally, our guide on a sick child who will not eat may help.

Frequently asked questions about a child vomiting at night

My child is sick at night but fine during the day — what is going on?

Often something ordinary: a tummy bug settling, reflux in a baby, or another infection such as a urinary tract infection. Vomiting in children usually stops within 1 or 2 days. If it keeps happening at night, or first thing in the morning before eating, mention it to your GP so it can be looked at properly.

My child is being sick at night without a temperature — do I still need advice?

Possibly. The warning signs apply regardless of temperature. Blood in the vomit, vomit that looks like ground coffee, green vomit or a sudden severe tummy ache mean 999 or A&E. If your child keeps being sick and cannot keep fluid down, call NHS 111 the same day.

Can my child choke if they are sick in their sleep?

Keep your child upright while they are being sick, and stay within earshot for the rest of the night if it has happened more than once. Do not adopt a particular sleep position on your own to prevent it — ask your health visitor or GP what is appropriate for your child's age.

How much should my child drink after being sick?

Small amounts, often. Give plenty of fluids such as water or squash, taken in small sips rather than a full cup at once. For babies who are being sick, try giving small feeds more often than usual. There is no fixed millilitre target — if you are unsure, ask a pharmacist or your GP.

When should I take a vomiting child to A&E?

If they vomit blood, if the vomit looks like ground coffee, or if it is green. Also if they have a sudden severe tummy ache, or if the vomiting started after a bang to the head. A baby who keeps being sick needs urgent advice from NHS 111 or your GP straight away.

What practically helps at night when a child is being sick?

Hold them upright, let them rinse their mouth, then change the bedding. Offer small sips at short intervals and leave solid food until morning. Keep a spare sheet and a bowl within reach. If it carries on for hours and nothing stays down, call NHS 111.

Summary: when does night-time vomiting need a doctor?

Situation	What to do
Vomiting blood or vomit like ground coffee; green vomit	Call 999 / go to A&E
Sudden, severe tummy ache; vomiting after a fall or a bang to the head	Call 999 / go to A&E
A baby who keeps being sick	NHS 111 or GP straight away — 999 if seriously unwell
Keeps being sick and cannot keep fluid down	Call NHS 111 the same day
Under 5 with fewer wet nappies than usual; over 5 with dark pee or peeing less	Call NHS 111 or your GP urgently
Sick once or twice, alert in between, taking small sips	Watch and keep offering sips — log it in Mona