Even after you've changed them, fed them and walked around tapping their backs for what seems like hours, they still yell down the house.
What could they possibly need still?
Then you look them in the eye and see that they're not actually crying at all – despite the fact that their scarlet faces are all screwed up and sweaty.
And that's because, despite what they'd have us believe, newborn babies don't cry.
Your little bundle of joy is born without fully formed tear ducts so they're unable to cry properly during the first few months.
According to the NHS, most babies start to cry from around two weeks of age, but others can take up to two months before their tear ducts are fully formed.
We don't actually know why babies are born without that function ready to go.
But that lack of tear ducts can actually cause issues for babies who might produce tears without the necessary drainage facilities.
Our tear ducts act as drainage systems. When we produce tears, we need somewhere for all that moisture to go and usually, it filters into the corner of our eyes before running down our noses.
Anger or upset aside, we produce tears in a bid to keep our eyes moisturised and free from dust and dirt. Everytime you blink, it's like having the windscreen wipers on – moving tear fluid across the eyeball and into the duct to drain away.
If you don't have fully functioning tear ducts, however, that liquid ends up spilling over the eyelids and running down cheeks – like an overfull glass of water.
Babies can get blocked tear ducts, which means that the tears don't drain away properly.
The NHS says that: "The main symptom is watering eyes, with tears pooling in the corner of the eye, spilling over onto the cheeks. This occurs even when a baby is not crying. Symptoms may get worse when the baby has a cold or during cold weather, as tear production increases.
"Sometimes, a baby’s eyes may look sticky or crusted when they wake. Occasionally, the eye may look a bit pink, which may be a sign of conjunctivitis or inflammation of the eye covering."
If your baby's eyes are sticky or crusty on waking, all you have to do is gently wipe their eyes with gauze and some cooled, boiled water.
A GP might also massage their eyes to encourage the duct tot open.
If it continues for some time, there is a surgical solution.
"Sometimes, the duct has not opened by the time the baby is one year old.
"In these cases, the doctor may suggest a procedure to open the ducts using a tiny probe while the baby is under anaesthetic. Occasionally, a tiny drainage tube may be inserted into the duct to keep it open."
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