Twitching and Jerking in Babies

When to get help

Call emergency services — 999 in the UK, 112 or 999 in Ireland and across the EU, 911 in the US and Canada, 000 in Australia, 111 in New Zealand — if your baby has a fit for the first time, if a fit lasts more than five minutes, if one fit follows another without your baby recovering in between, if they are not breathing normally, if the lips or skin turn blue or grey, or if they do not return to their normal self afterwards.

Seek urgent advice, and ask specifically for a paediatric opinion, if you see:

• Clusters of sudden movements — a run of head nods, or the arms flinging out and the body bending forward, repeating every few seconds for a minute or two, often on waking. The American Academy of Pediatrics describes this pattern in infantile spasms and stresses that it needs urgent assessment, because early treatment matters.
• Jerking that continues while your baby is awake, or that does not stop when you gently hold the moving limb.
• Repeated staring episodes with unresponsiveness, lip smacking or repetitive mouth movements.
• Any jerking alongside fever in a baby under six months, or with unusual drowsiness, a bulging soft spot, a rash that does not fade under a glass, or vomiting.
• Loss of skills your baby previously had, such as no longer smiling, tracking or holding their head.

What ordinary sleep twitching looks like

Most babies twitch in their sleep. Fingers flick, an arm jerks, a leg kicks, the face flickers into a brief smile. It happens most in the lighter phases of sleep and in the first months, when the nervous system is still maturing, and it can go on for minutes at a time in short runs.

Three features make it benign. It happens only during sleep. It stops immediately when your baby wakes, including if you wake them deliberately. And your baby is completely normal in every other way: feeding well, alert when awake, developing as expected.

You can test the second point yourself. Pick your baby up and rouse them gently. Benign sleep jerks disappear the moment the eyes open. A seizure does not stop because a baby wakes up.

The other harmless movements

A jittery, trembling quality to the hands and chin in the first weeks is common, particularly when a baby is crying, startled, hungry or being undressed. The distinguishing feature is that it settles when you hold the limb still or when your baby is comforted. Persistent jitteriness in a newborn who is also feeding poorly is worth raising, but the everyday version is not.

The startle reflex produces a dramatic full-body reaction to a noise or a change of position: arms out, fingers spread, then arms drawn back in, often with a cry. It is a normal newborn reflex and usually fades by around four to six months.

Shuddering attacks look like a brief shiver through the head and shoulders, often during feeding or excitement, with your baby fully aware throughout. Rhythmic rocking or head banging into a mattress at bedtime is a self-soothing habit rather than a neurological event.

What a seizure looks like in a baby

Seizures in babies are less obvious than in adults. There may be rhythmic jerking of one limb or of one side, stiffening of the whole body, eyes rolling or fixing to one side, repetitive lip smacking or chewing, cycling movements of the legs, or a sudden pause in breathing with a change of colour.

The features that separate a seizure from a twitch are that it happens whether awake or asleep, it carries on if you hold the limb, your baby is not responsive during it, and afterwards they are often sleepy or floppy for a while.

Febrile seizures are the commonest kind in young children. The NHS describes them as usually happening in children between six months and five years, most often with a high temperature. Most last under five minutes and are frightening rather than dangerous. In a baby under six months, though, a fit with a fever is not assumed to be a simple febrile seizure and is investigated properly.

Infantile spasms deserve their own paragraph

This is the pattern most often mistaken for wind, reflux or a startle. The movements are brief, lasting a second or two, but they come in clusters: a run of them every five to ten seconds, lasting a minute or several, and typically on waking. The body bends forward, the arms fling out or up, the head nods. Between clusters your baby seems normal.

They usually begin in the first year. Parents often report that their baby seems less smiley, less interested, or has stopped doing something they used to do. The AAP is clear that this pattern needs prompt medical attention, because outcomes are better with early treatment. If you think you are seeing it, film it and ask for an urgent appointment rather than waiting for a routine one.

Film it

The single most useful thing you can do is record a video on your phone. Episodes almost never happen in a consulting room, and a fifteen-second clip answers questions that ten minutes of description cannot. Get the whole baby in frame, include the face, keep the light on, and try to catch the start.

If you can, gently touch or hold the moving limb during filming and say out loud what you are doing. Whether the movement stops when held is one of the things a paediatrician most wants to know.

What to do during a fit

Put your baby on their side on a flat, safe surface away from anything hard. Note the time it starts. Do not put anything in the mouth, do not restrain the movements, and do not try to give medicine or a drink during it. Loosen tight clothing around the neck. Stay and watch, and time it. Call emergency services for a first fit, for one lasting more than five minutes, or for one that repeats before your baby has recovered.

Afterwards, expect your baby to be drowsy. Let them sleep, keep them on their side, and get them seen. A first fit in a baby is always assessed, even if they have bounced back by the time you arrive.