The main causes of the sunken fontanel in babies


  1. Features of the structure and appearance
  2. Causes
  3. If the baby has a sunken fontanel – what should I do?

The presence of fontanelles is a specific feature of the infant age. No wonder parents cautiously and with awe belong to the “soft spots” on the head of their offspring.

Seeing the slightest changes, they worry about whether everything in ok with the baby. This article will answer questions disturbing many mothers: what is the sign of the fontanel inflow, how it looks and what needs to be done.

Features of the structure and appearance

A newborn baby is not a small copy of an adult person. He has a number of structural and functional features, which are characteristic only for infancy. One of them – this is the presence of fontanelles on the head.

A newly born baby has 6 on their head: 2 large and 4 small ones. How many months does the fontanel overgrow? Last close just a couple of days after birth: new parents may not even notice them.

The posterior large disappears within 2-3 months. Front big it closes gradually by 1-2 years.

The sunken fontanel in the babyAnatomically fontanel represents an elastic membrane between not fused cranial bones in a baby. Parents are often afraid even touch him: after all, it seems to them that this can cause damage the brain of a child directly below fontanel.

But fontanels are not at all as defenseless as they seem: they consist of strong and flexible connective tissue, which gradually ossifies at the edges, thereby ensuring their closure.

And at the same time, the fontanel is a kind of litmus test health status of the baby. If he is too slow or rapidly overgrowing, bulging, or vice versa retracted inward – it signals some kind of trouble for the baby.

In a healthy baby, the large anterior fontanel looks like slightly rhomboid pulsating area of ​​the scalp on the crown of the head. AT Normally, it does not have to be perfectly flat: it is allowed barely noticeable bulging or drooping. If you touch him – you can feel the pulsation, just as the blood pulsates in veins.


Often an alert (and sometimes overly suspicious) parent beats anxiety, noticing the onset of the fontanel on the head of his child. Before In total, in such cases, the degree of confluence should be determined: slight retraction of the fontanel membrane is quite normal phenomenon.

The sunken fontanel in the babyIf the fossa noticeably sinks into compared with what it was before – this suggests that on any adverse factors are acting on the baby.

  • In the first place in the list of causes of retreat – lack of fluid in the diet of a baby. Simply put, mild dehydration can manifest itself in this way. Often this happens when a mother breastfeeds her baby and at the same time does not dope him. Meanwhile, in the hot season, breast milk is often not able to fully satisfy the child’s need for liquids. Artificially fed babies to solder all the more necessary.
  • Dehydration and descent of the fontanel as a result of this it can happen for a more serious reason: if the baby has diarrhea or vomiting. In this case, it is necessary to find out the root cause. digestive disorders, eliminate it and be sure to fill fluid balance in the body of the baby.
  • A noticeable retraction of the fontanel can occur in postponed children. In this case, it is considered as a variant of the norm and with time passes.
  • If the fontanel is very pulsating and the difference is clearly noticeable between its falling and bulging – it is worth consulting with doctor about this. This is normal during screaming and crying baby, but if in a calm state with the naked eye strong ripple is visible – this may be the first sign of problems with health in infants.

If the baby has a sunken fontanel – what should I do?

The parental care algorithm in this case is following:

  • It is necessary to clarify: what did the fontanel look like before? Maybe he always seemed a bit involved – then this is a variant of the norm.
  • If the fontanel is noticeably sunken compared to its normal state – it is necessary to give the baby a lot to drink. Indeed, the lowering of the fontanel is a signal of beginning dehydration. The daily requirement of the child for fluid (all fluid is taken into account, consumed during the day in any form):
Child age The amount of fluid needed (ml / kg) Child age The amount of fluid needed (ml / kg)
first week of life 90 from 6 to 9 months 140
from 8 days to 3 months 135 from 9 months to 1 year 130
from 3 to 6 months 150 from 1 year to 2 years 125

According to the table, if the baby is 2 months old and weighs 5 kg, then in day he should receive: 135 x 5 = 675 ml of liquid. If the baby while breastfeeding or artificial feeding, subtract the total volume eaten by the baby from this figure breast milk or mixture – the result will be that amount liquid to be given to the child in addition to the main dose food. Many mothers are interested in the question of when can I cut a baby in first time.

Find out from our publication where the bald spot comes from baby.

  • If the child is dehydrated as a result of vomiting or diarrhea, it should be consult a doctor to find out and eliminate the cause dyspepsia.
  • A doctor’s consultation requires a situation when the fontanel of the baby in calm state began to pulsate more than usual. Quite it is possible that this is a variant of the norm, but it is better to play it safe.

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