First published May 18, 2019.
Ten centimetres is the number every expectant parent hears about. It is the width the cervix needs to open to, "fully dilated", before the pushing stage of a vaginal birth can begin. Said out loud it sounds small. Seen as a hole in a board, it looks rather more impressive.
In April 2019 a midwife-led clinic, SCV Birth Center in Santa Clarita, California, posted photos of a round maple-wood board with ten circular holes, each cut to match one centimetre of cervical dilation from 1 to 10. A few days later Facebook user Steffanie Christi'an reshared the picture with her own short caption, and her post was shared more than 180,000 times. Thousands of parents, midwives and nurses joined in, some amazed, some laughing, some quietly proud.
The board itself is a teaching tool made by a small woodworking shop. It turns a measurement that is normally felt by a midwife's fingers into something you can see and touch. Below we walk through each photo, explain what dilation actually means during labour according to the NHS and the World Health Organization, and clear up a few common myths. Nothing here replaces advice from your own midwife or doctor; if you have questions about your pregnancy, talk to them.
The viral dilation board, photo by photo
This is the image that travelled furthest: the board held over a newborn's head, with Steffanie Christi'an's caption overlaid. The 10cm hole frames the top of the baby's head, which is the whole point of the comparison. At full term a baby's head is roughly that wide, which is why the cervix has to open so far.
A closer view of the same photo shows how the holes step up in size from a tiny 1cm opening to the large 10cm circle. The numbers are engraved beside each hole. Birth educators use boards like this so people can match the numbers they hear in labour to a real size.
SCV Birth Center's own post, dated 7 April, introduced the board with a cheerful note about ten centimetres being just right for a little head. The clinic's version had a few hundred shares; the reshare two days later is what made it a global talking point.
The board on its own, photographed flat on a white sheet. It is about 12 inches (roughly 30cm) across and half an inch thick, made from maple. Laid out like this, the jump between 4cm, when the NHS says established labour usually begins, and 10cm is easy to see.
Steffanie Christi'an's post from 9 April 2019, which gathered around 15,000 reactions and more than 181,000 shares. Her caption joked that this is why mothers "deserve all the things". The tone was celebratory rather than frightening, and most replies followed it.
A hand placed next to the 7cm and 8cm holes gives a sense of scale. Midwives traditionally estimate dilation by touch during a vaginal examination, which is why the figures are always approximate. Two experienced examiners can easily differ by a centimetre.
The same design hung in front of a bookshelf, showing it is also sold as wall art. According to its Etsy listing, the board is an original design from FromJennifer, a shop run by Jennifer Compton in Buffalo, Missouri, and can be personalised with a name, logo or date.
What 1 to 10 centimetres means in labour
The cervix is the narrow lower end of the uterus. Late in pregnancy and during labour it softens, thins out (called effacement) and opens (dilation). The NHS describes labour in three stages:
- Latent phase: the cervix softens and begins to open. Contractions are often irregular, and this phase can last many hours or even days. It is usually the longest part of labour.
- Established labour (first stage): starts when the cervix has opened to about 4cm and contractions are stronger and more regular. It continues until the cervix is about 10cm, fully dilated. For a first baby this usually takes 8 to 18 hours; for later babies, around 5 to 12 hours.
- Second stage: from full dilation until the baby is born. The NHS says pushing should usually take no more than 3 hours for a first baby and 2 hours for later births.
- Third stage: delivery of the placenta, either with an injection to speed it up (active management) or naturally (physiological management).
The World Health Organization's 2018 intrapartum care recommendations define the active first stage as starting from 5cm rather than 4cm, and note that the old rule of thumb of 1cm per hour is unrealistically fast for some women. Slower progress on its own is not a reason for routine intervention. Different countries and hospitals use slightly different cut-offs, so the numbers you hear may vary.
What birth workers and buyers said about the board
A five-star Etsy review from April 2019. The reviewer describes a household with an OB-GYN and a labour-and-delivery nurse and doula, and says she bought a second board for the nurses and residents on her unit. It shows the board being used as a professional teaching aid, not just a novelty.
A review from March 2019 by a birth worker who says she hides the numbered side and uses the board to reassure clients that their baby can fit. That reassurance is a common reason doulas and midwives keep models of the pelvis and cervix.
A January 2019 review from a high school health teacher who planned to use the board in sex education lessons. Seeing actual sizes can make reproductive anatomy more concrete for teenagers than diagrams in a textbook.
How parents reacted on Facebook
A commenter expecting her third child pushed back against the alarm in the thread, arguing that bodies are built for this and that many women choose to give birth more than once. Her view matches what midwives often say: dilation is a normal, gradual process rather than a sign that something is going wrong.
Another mother called the days her children were born the best of her life and remembered hearing that she had reached 10cm as a huge relief, while being honest that it hurt a great deal. Reaching full dilation often marks the shift from waiting to actively pushing.
A reply from a parent grateful for her two caesarean sections, despite a hard recovery. In a planned caesarean the cervix does not need to dilate at all, because the baby is delivered through an incision in the abdomen and uterus.
A short reply celebrating women's strength. Comments like this made up a large share of the thread, which stayed largely supportive.
This commenter noted she had given birth without anaesthesia. Pain relief options in labour range from breathing techniques and water to gas and air, opioid injections and epidurals; which one suits a person is a decision to make with the care team.
A mother who said she walked around at about 4cm for three weeks before her baby arrived. Some people, especially those who have given birth before, can be partly dilated for days or weeks without being in established labour, which is one reason a single measurement cannot predict timing.
One commenter said the board actually reassured her: dilation had felt abstract during her first labour, and she found comfort in knowing the cervix opens before the pushing begins. Understanding the stages can make labour feel less mysterious.
A joke about asking a husband whether it looked like this during the birth, and his pale-faced answer. Partners often see a very different side of labour from the person giving birth, and humour was a big part of how people shared the post.
A parent who joked that giving birth was easier, and much quicker, than parenting. Plenty of replies made the same point in different words.
Someone else said the chart cured her baby fever instantly. Light-hearted reactions like this helped the image spread well beyond parenting groups.
A mother of two admitted she had never seen what dilation looks like, and said that if she had, she might have stayed childless. Most people never see the measurement at all, since it is assessed by touch.
A commenter recalled being fully dilated and told to hold off pushing for an hour while waiting for the doctor. Delays like that happen, and in many births a midwife, not a doctor, is the person who guides the second stage.
A brief reply saying the board made her want another baby, a reminder that the same image can stir very different feelings.
A woman close to her due date tagged the photo as one of the things you would rather not see at nine months. If late-pregnancy worries are building, a midwife appointment or antenatal class is a good place to talk them through.
The last comment recalls holding a newborn minutes after birth and wondering aloud how the baby fitted through the pelvis. During birth the bones of a baby's skull can overlap slightly and the mother's pelvic joints loosen, which helps make the passage possible.
Myths the chart can't settle
"Dilation tells you when the baby will arrive." It does not. A person can sit at 3 or 4cm for days, then progress quickly. Contractions, effacement, the baby's position and how the cervix feels all matter too.
"Labour should move at 1cm an hour." This old benchmark has been dropped by the WHO for being too fast for many healthy labours.
"Ten centimetres is always exactly ten." The figure is an estimate made by touch. "Fully dilated" means the cervix can no longer be felt around the baby's head.
"The comparisons to cereal hoops and bagels are precise." They are memory aids, nothing more; food sizes vary.
Why a simple wooden board struck a nerve
Most of us learn about labour through words and numbers, and the board did something words cannot: it made the size real. That is why birth educators, nurses and teachers bought it, and why the reactions mixed awe, laughter and pride. If you are pregnant and the numbers feel daunting, the most useful next step is a conversation with your midwife or doctor about what each stage might look like for you, and when to call them. The NHS advises contacting your midwife or maternity unit if your waters break, you have bleeding, your baby is moving less than usual, or you think you are in labour before 37 weeks.
Sources: Photos and posts by SCV Birth Center and Steffanie Christi'an; board design and reviews from FromJennifer on Etsy; NHS: the stages of labour and birth; Wikipedia: Cervical dilation; Lamaze International summary of the WHO 2018 intrapartum care recommendations.
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