The Cough That Sounds Like a Seal Always Starts at Midnight

He went to bed with a slightly rough voice and nothing else. At half past midnight there is a noise from his room that you have never heard a human being make, and you are standing in the hallway with your heart going.

That bark is croup. It sounds far worse than it usually is, and knowing what it is at half past midnight is most of the battle.

Most parents meet croup once and never forget the sound. It turns up in autumn and early winter, mainly in children between about six months and three years old, and the usual culprit is a parainfluenza virus that in an older child would only have been a hoarse week.

Why the middle of the night, every time

Lying flat lets fluid settle around an already swollen airway. Natural anti-inflammatory hormones dip overnight. And the airway of a two year old is roughly the width of a drinking straw, so a millimetre of swelling takes out a serious proportion of it.

The same child who barked like a sea lion at one in the morning will be eating cereal and demanding cartoons by nine, sounding merely croaky. Then it comes back the next night, often worse, which catches people out. Two bad nights and one mediocre one is the ordinary shape of it.

What to do in the first ten minutes

Pick them up and sit them upright against you. Talk in the flattest, most boring voice you own. Crying and panic make a child breathe harder and faster through a narrowed pipe, so your calm is not a nicety here, it is treatment.

Then take them to cold air. Wrap them in a blanket and stand at an open door or window, or step into the garden. There is no strong trial evidence that cold air fixes croup, and paediatricians are honest about that, but it settles a huge number of children within ten or fifteen minutes and it costs nothing. Steam over a hot tap is the old advice and has been dropped in most places, partly because the evidence never showed up and partly because of scalds.

Paracetamol or ibuprofen for comfort if there is a fever, fluids in small sips, and a nightlight on so you can see their chest without switching on the big light. Do not give cough medicine. It does nothing for this, and it is not advised for young children anyway. That is the same argument we make about reaching for melatonin. The NHS page on croup is the clearest short summary if you want to read one thing at three in the morning.

The line between frightening and dangerous

Croup is loud, which makes every case feel like an emergency. Most are not. Here is the honest sorting.

• Barking cough, hoarse voice, no noise on breathing in while they rest. This is the common version. Manage it at home and see the doctor in the morning.
• A high whistle or rasp when they breathe in, but only when upset or coughing. Borderline. Get them seen today rather than tomorrow.
• That whistle while they are sitting quietly, skin pulling in under the ribs or at the base of the throat, nostrils flaring, or a child too tired to fight you. Go now. This is the one that needs a hospital.
• Drooling, refusing to swallow, sitting very still and leaning forward, no cough but real distress. Emergency, and a different diagnosis. Do not put anything in their mouth, call for help.

A quiet child in the middle of a croup attack is more worrying than a screaming one. Screaming takes air.

The second night, and the mistake almost everyone makes

The mistake is assuming the good morning means it is over. It is a night illness. Plan the evening of day two as though it will happen again, because there is a decent chance it will.

That means a few boring preparations before bedtime, and boring is the point. Have the pushchair or the car keys where you can find them. Know which hospital you would drive to. Put an extra pillow under the mattress at the head end so they sleep on a slight slope rather than flat, and leave a blanket by the back door.

Sleeping in the room with them for a night or two is reasonable. It does not create a habit that lasts past the illness, whatever you have read about sleep regressions. Anyway, you were not going to sleep in your own bed listening for it.

Is it catching, and can you stop it

The virus is catching in the ordinary way, though what one child does with it as croup another will do as a plain cold. Siblings often get the mild version. Hand washing and not sharing cups help at the margins, and there is no vaccine for the main viruses involved.

Children grow out of it. As the airway widens with age, the same infection stops being dramatic. Most families see croup a handful of times before school age and then never again, though a child who gets it repeatedly is worth mentioning to the doctor, because a few of them turn out to have something else going on underneath.

What stays with parents is the sound. If you have heard it once, you will identify it through a closed door from the other end of the house, and that is genuinely useful.

What tomorrow looks like

Tired. Both of you. A croaky child, an ordinary breakfast, a day of low expectations. Book the appointment in the morning even if the night ended calmly, because the steroid works best given before the third bad night rather than after it, and because it is easier to be reassured by a doctor in daylight than to make the call yourself at one in the morning again.

And if you are reading this standing in a doorway with a coughing child on your hip, wrapped in a blanket, waiting for the cold air to do its work: that is exactly the right place to be.