Week 11 of Pregnancy: Teeth and Bones
Week 11 is when the first-trimester screening window opens and the nausea often starts loosening its grip. The baby is about the size of a racquetball, with hardening bones and tooth buds forming. Your two jobs are understanding the scan that is coming and getting ahead of the announcement.
- Find out whether a nuchal translucency scan is offered to you and when the booking window closes.
- Learn the difference between a screening test and a diagnostic test before any result arrives.
- Write the announcement running order down, including who tells which side of the family.
- Check the beneficiaries on your life cover and book the will conversation you have been avoiding.
▸Bones, tooth buds and rapid growth
At 11 weeks pregnant the baby is around four centimetres and entering one of the fastest growth phases of the pregnancy, with length roughly doubling over the next few weeks. Bones are hardening, tooth buds are forming under the gums, and the fingers and toes have fully separated.
For her, week 11 is often when the worst of the sickness begins easing, though plenty of people are still fully in it and some carry it much further. Appetite tends to return with strong opinions attached. Do not treat improvement as a milestone she is supposed to hit on schedule.
▸The nuchal translucency window opens
In a window that commonly runs from about week 11 to week 14, many health systems offer a nuchal translucency scan. It is an ultrasound measuring a small pocket of fluid at the back of the baby's neck, usually combined with a blood test and other factors to produce what is called combined first-trimester screening.
What comes back is a chance, expressed as a probability, that this pregnancy is affected by particular chromosomal conditions. It is not a diagnosis and cannot be one. A clinician talks you through what the number means in your situation, and the language matters: higher chance is not the same as a finding.
If a result does come back as higher chance, the next conversation is usually about diagnostic testing, most commonly chorionic villus sampling or amniocentesis depending how far along the pregnancy is. Those can give a definitive answer because they sample tissue or fluid directly, but they are invasive and carry a small risk of miscarriage that the clinician will explain. There is no right answer here, and nobody should be pushing you toward either choice.
▸Plan the announcement before you get ambushed
Agree the running order now, while it is calm. Who hears it first, who would be genuinely hurt to learn it second-hand, and in what sequence. Parents and siblings usually deserve to be told directly rather than finding out from a group chat.
Then agree the boring rules: who tells which side of the family, what you say if someone guesses, whether anything goes on social media at all, and the absolute rule that neither of you posts a photo of the other without asking. The uncomfortable part is worth covering too. Agree what you would want said, and to whom, if something went wrong. That is precisely why some couples deliberately tell a small circle early.
▸The paperwork nobody wants to do
This is the least fun mission on the list and probably the highest leverage. Review your life cover and income protection. If you have not looked since before anyone depended on you, the numbers were set for a different life. Check who is actually named as beneficiary, because stale beneficiary details are a common and expensive mistake.
Then the will. People put this off for years and then discover that arranging guardianship is the one piece of admin that cannot be improvised later. None of this is advice about what to buy, and this is not where to get that: a licensed adviser or solicitor is who you want, and where you live changes the answers substantially. The point of week 11 is to open the file, not close it.
▸What she is going through
- Nausea often begins to ease.
- Hunger returns with opinions.
▸Your missions this week
Concrete things worth doing in week 11, not just being supportive.
▸Questions dads actually ask
What is the nuchal translucency scan?
An ultrasound, commonly offered between about weeks 11 and 14, that measures fluid at the back of the baby's neck. Combined with a blood test and other factors, it produces a chance figure for certain chromosomal conditions. It is a screening test, so it gives a probability rather than a diagnosis, and a clinician explains what your result means.
When can you hear the baby's heartbeat?
A heartbeat is usually visible on ultrasound well before it can be heard with a handheld doppler, and doppler use in clinic typically begins later in the first trimester. It does not always pick up early, often simply because of the baby's position. Your midwife or doctor is the one to tell you what any attempt does or does not mean.
When should we tell our parents we are pregnant?
There is no medical rule, only convention. Many couples wait until after the dating scan; others tell parents early specifically so support exists if something goes wrong. Decide together, agree the order so nobody important hears it second-hand, and agree in advance who is allowed to pass it on.
▸Sources
Checked against these pages on 17 Oct 2026. Where the guidance differs by country, follow your own midwife or doctor.
- NHS: Week 11 of the week-by-week guide
- ACOG: How your fetus grows during pregnancy
- NHS: Screening tests in pregnancy
- ACOG: Prenatal genetic screening tests
▸Situations you might be hitting right now
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This is general information for expectant fathers, not clinical guidance. Anything about symptoms, pain, or bleeding goes to your midwife, doctor, or emergency service, not to an app.
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