When a cough comes on at night and disrupts a child's sleep, parents often ask the same question: when should you see a doctor? A baby's cough is one of the most common reasons for a medical visit before the age of 2, yet it is almost never dangerous in itself. It still needs to be read correctly. Its type, its timing and how it evolves say a great deal about what is happening in a little one's airways. Here is what a cough means in a baby, the signs that call for medical advice and the steps that genuinely help them breathe more freely.
A baby's cough is a defence reflex, not an illness
Coughing means expelling. The reflex starts from receptors located in the larynx, the trachea and the bronchi: as soon as mucus, dust or acid reflux stimulates them, the body triggers a sudden exhalation to clear the passage. In infants, this mechanism is used all the more because their airways are narrow, their mucous membranes produce a lot of mucus and they spend most of the day lying down.
Trying to stop this cough at all costs would therefore deprive the baby of its own cleaning system. The aim is not to silence it, but to reduce the discomfort it causes and to address what triggers it.
The most common causes before the age of 2 can be counted on one hand: seasonal viral infections (colds, nasopharyngitis, bronchiolitis), gastro-oesophageal reflux, which is very common in infants, air that is too dry or overheated, and exposure to irritants such as smoke, dust or pet hair. Teething or saliva swallowed the wrong way can also trigger a few isolated coughing fits, without any infection behind them.
Dry cough, chesty cough, night-time cough: what each type tells you
Dry cough
Short and repetitive, bringing nothing up, it comes from irritation of the upper airways. It appears at the very start of a cold, with an allergy or in an overheated bedroom. It is tiring because it comes in bursts, often at bedtime.
Chesty cough
Deeper and "wetter", it moves secretions. A baby cannot spit: they swallow what comes up, which explains the regurgitation and softer stools that so often come with a cold. This type of cough is doing its job, it clears mucus.
Cough that comes back at night
Lying down makes mucus move from the nose to the back of the throat, and the mucous membranes cool down: coughing fits therefore cluster between 1 and 5 in the morning. If the cough becomes hoarse with a whistling sound when breathing in, it points to laryngitis and calls for medical advice that same night.
Signs that call for prompt medical advice
Some situations are not up for debate.
- Under 3 months, any cough justifies calling the doctor or paediatrician, without waiting until the next day.
- Rapid breathing, the ribs or tummy drawing in with each breath, lips turning bluish.
- A fever above 38.5 °C, or a fever lasting more than 48 hours.
- A baby who drinks noticeably less than usual, has significantly drier nappies or seems unusually listless or drowsy.
- A cough lasting more than 10 days, or one that comes back stronger after a period of improvement.
- A sudden coughing fit in a child who was handling a small object: inhaling a foreign body is an emergency.
Between 2 and 8 months, bronchiolitis remains the leading winter cause of cough with breathing difficulty. It can be recognised by the combination of a chesty cough, wheezing and feeds that become laborious. It needs close monitoring and its management is a matter for the doctor.
The steps that really matter at home
The first of all is nasal washing with saline solution, several times a day and always before each feed and before bedtime. A clear nose means less mucus running down to the throat during the night. With the baby lying on their side, put a whole single-dose vial into the upper nostril, then turn the child over and repeat on the other side.
Three other levers make a real difference at night:
- the bedroom temperature, kept between 18 and 19 °C, with 10 minutes of fresh air every day, even in winter
- hydration, offering the breast or bottle more often and in smaller amounts, which thins secretions better than any preparation
- a slight incline, obtained by raising the head end of the mattress a little, never by slipping a pillow into the cot, which is not allowed before the age of 2
To humidify the air, a damp cloth on a radiator is more than enough. Inhalations and nasal sticks are reserved for older children: before the age of 3, everything aimed at clearing the airways goes through nasal washing and the bedroom air, never through inhaled steam. Hydrosols, the waters obtained from the distillation of fresh plants, offer a very gentle alternative: a light mist on the pillow, or a little Chamomile floral water on a handkerchief placed away from the cot, gives a soothing scent without direct contact with the baby's skin.
Aromatherapy for little ones: a question of chemotype and age
Two rules frame aromatherapy for babies, and they allow no exceptions. No Essential Oil before 3 months, whichever oil and whichever route. And never pure oral use or undiluted application for a little one.
After 3 months, everything depends on the choice of molecule. The same plant can produce radically different Essential Oils depending on its chemotype, in other words the main molecule the plant produces according to its soil and climate. Thyme is the clearest example: Thymol thyme is a skin-irritating phenol that must be strictly avoided in children, whereas Thujanol thyme belongs to the monoterpenols, a family far better tolerated by delicate mucous membranes. Same botanical name, the same "thyme" label for the non-specialist, two opposite safety profiles.
This is the logic behind formulas designed for little ones. Sweet inula is recognised for its action on bronchial secretions, thanks to its esters. Black spruce and Balsam fir, rich in monoterpenes, are relevant for the respiratory system while keeping a gentle profile. Sweet marjoram, rich in terpinen-4-ol, helps calm the irritation spasms that set off night-time coughing fits. Lemon essence completes the blend with its purifying side. All are used diluted in a vegetable oil, as a massage on the upper back and chest, and never on the face or under the nose.
Two families remain strictly ruled out before the age of 6: Essential Oils rich in menthol, such as Peppermint, and those containing camphor or neurotoxic ketones. In infants, they can cause a spasm of the larynx and sudden breathing difficulty. This is why respiratory solutions formulated for babies rely on molecules chosen for their tolerance, at concentrations far below those of an adult formula, rather than on a "lighter" version of a blend for older children.
Three common mistakes when a baby coughs
Honey before 1 year. It is the most widespread piece of traditional advice and the riskiest: before the first birthday, honey exposes babies to infant botulism. French health authorities formally advise against it in this age group. After 1 year, however, a spoonful of honey in the evening is a recognised aid for an irritating cough.
Syrup from the medicine cabinet. Since 2010, mucus-thinning products have been advised against for children under 2 in France, because they increase congestion in a baby who is unable to cough up phlegm. A syrup intended for an adult is never a baby syrup at a reduced dose.
Trying to stop the cough. A chesty cough that lasts four days and eases off is doing exactly its job. What matters is how the baby drinks, sleeps and breathes between coughing fits, far more than the number of fits themselves.
One last practical tip: note the time of the coughing fits for two nights before the appointment. A regular pattern early in the night points to post-nasal drip, a cough that comes rather at the end of the night to reflux, and fits triggered by laughing or exertion to a bronchial origin. The paediatrician will get far more out of this than out of a general description, and it is worth more than all the advice on respiratory comfort you can read elsewhere.