Colic and evening fussing

The rule of threes

The classic definition was known for decades as the rule of threes:

• Crying for more than 3 hours a day
• On more than 3 days a week
• Over a period lasting more than 3 weeks

More recent definitions loosened those numbers. The criteria in common use today look for three things: the baby is under five months old, the recurrent long stretches of fussing have no obvious cause, and the baby is otherwise well — no fever, growing normally, feeding fine.

How many babies it affects depends on which definition you use; studies report figures between 5% and 25%. So it is neither rare nor universal.

The natural curve of crying

Even in babies who never get labelled colicky, crying time does not follow a flat line in the early months. It rises after birth, usually peaks around six weeks, and then falls away. In most babies it has dropped noticeably by three to four months.

That curve does not explain colic on its own, but it does say something useful: during the hardest weeks you are struggling because that is what early infancy looks like, not because you are doing something wrong. And the period ends.

Fussing clustering into the evening is common too. Nobody knows why. The stimulation accumulated over the day, tiredness, and the cluster feeding that tends to happen at those hours are all offered as explanations.

What helps

The evidence here is not strong either. The following are widely tried and help some babies:

• Carrying, walking, rocking — continuous, monotonous movement
• A steady low-level sound (white noise, a running shower, shushing)
• Swaddling — only before the baby starts rolling, and leaving the hips free to move
• A dummy
• Slowing the feed down, pausing partway through to burp
• Reducing stimulation in the evening: dim the lights, fewer visitors, screens off
• A warm bath, skin-to-skin contact

Do not use the drops, herbal mixtures and supplements that circulate online without asking your doctor first. Safety in infants has not been established for some of them, and Agubu makes no recommendation on this.

The most important point

Prolonged crying is one of the strongest drivers of parental exhaustion, and worldwide it is the most common trigger of the shaking incidents that injure babies.

When you reach the point where you cannot take any more: put the baby down on their back somewhere safe, leave the room, and take a few minutes for yourself. Nothing happens to a baby who is crying but lying safely. Something does happen to a baby who is shaken.

This is not an admission of weakness; it is a care technique. If you are on your own and reaching that point often, ask someone for help.

When to see a doctor

Because colic means "everything else is normal", anything that is not normal is not colic. See a clinician if:

• Crying goes on for more than three hours and nothing settles it
• There is fever, vomiting (especially green or forceful), a rash, or blood in the stool
• The cry sounds unusual — high-pitched, weak, or moaning
• Your baby refuses to feed or is not gaining weight
• The abdomen looks tight and hard
• The fussing started after four months, or has not eased by then
• Your instinct tells you something is wrong

In an emergency, call your local emergency number.

What colic crying looks like

What defines colic crying is not the tone of the sound but the picture: a healthy, fed baby with a clean nappy; long crying that starts at a set time of day, most often late afternoon or evening; and that is hard to settle with holding, feeding or anything else you know. The "symptom lists" on hospital pages are really describing how that picture shows in the body:

• Drawing the legs up to the tummy and stretching them out stiffly, arching the back
• Clenched fists, a flushed face
• A tight, bloated-looking tummy, passing wind during or at the end of the crying
• Crying close to a scream that a feed or a nappy change does not stop
• Bouts that return at roughly the same time each day, mostly in the evening

None of these signs means "colic" on its own; every one of them shows up in any baby who cries a lot. Colic is the name for this pattern when it recurs regularly, before 5 months, without any health problem behind it. If there is fever, vomiting, blood in the stool or poor weight gain, the list ends and the doctor begins.

Colic or normal crying? How to tell

Normal crying and colic are the same behaviour at different doses, so no single cry tells you which one you are looking at. What separates them is the pattern over days, which is why the answer usually comes from a few days of notes rather than from one bad evening.

• How long: most babies cry for one to two hours a day in total, newborns sometimes more. Colic means more than three hours, on most days, for weeks.
• When: ordinary fussing turns up at any hour, usually near a feed or past the wake window. Colic tends to start at about the same time each day, most often late afternoon or evening.
• Does it stop: normal crying eases once the need is met. Colic keeps going after the feed, the clean nappy and the cuddle.
• The body: a red face, a tight belly, legs pulled up and clenched fists are common in colic. They are not proof of a stomach problem; they are what hard crying looks like.
• The rest of the day: a colicky baby feeds, gains weight and is content between episodes. A baby who is unwell between episodes is not colicky; see the list further down.

You do not have to judge this from memory. Three or four days of noted start and end times show whether the three-hour line is really being crossed, and at what hour; it is also the first thing a clinician asks for. Agubu's care log covers sleep, feeds and nappies with one tap; the crying times go on paper or in your notes app beside it, as the colic diary article describes.

Sources

This article draws on the general guidance of the sources below. It contains no quoted text.

• Rome IV criteria for functional gastrointestinal disorders — definition of infant colic
• American Academy of Pediatrics (AAP) — crying and colic guidance
• NHS (United Kingdom) — infant colic and crying information
• Turkish Ministry of Health — infant and child follow-up guidance