The breathing practice and lanugo that arrived last week continue this week — the rhythmic inhaling and exhaling of amniotic fluid now a regular feature of foetal activity, the fine downy hair still covering the whole body. This week brings two new developments, both of them quietly extraordinary.
The skeleton, which began as soft cartilage, is hardening progressively into proper bone throughout the body. This process — ossification — has been underway since the early weeks and will continue for years after birth, not completing fully until early adulthood. What is happening this week is the acceleration of that process in the longer bones: the arms, legs, and spine. The skeleton your child will carry for their entire life is being laid down right now, week by week, in structural detail.
The foetus is now 93mm — a small pear — and has reached 70g. It is moving with increasing purpose and frequency, changing position, stretching, turning. The movements are still not detectable by most first-time parents — the uterine wall and amniotic cushioning are still too insulating — but the 16-week appointment next week may include a Doppler heartbeat check that gives a first audible sense of the baby's presence for those who haven't had scans.
My partner shone their phone torch at my bump at about fifteen weeks, mostly as a joke. Then we looked it up and found out the baby would actually turn away from it. We did it again, more carefully this time. I don't know what I expected to feel — it wasn't anything I could prove — but I cried a little anyway. This completely hidden, already responding creature.
The physical experience of weeks 13–16 continues to evolve in mostly welcome directions for most people. Nausea is behind the majority; energy is largely restored; appetite is back. Week 15 adds a few specific physical developments worth noting — some delightful, some that require a bit of context.
Heartburn and indigestion, which were mentioned as possible symptoms from around week 19 in the app's week data, may begin to appear for some people earlier than that as the uterus rises and begins to press on the stomach. The hormonal relaxation of the lower oesophageal sphincter — the valve between stomach and oesophagus — also contributes. Eating smaller meals more frequently, avoiding lying down immediately after eating, and propping the head of the bed slightly all help. Antacids that are safe in pregnancy include calcium carbonate-based preparations (Gaviscon, Rennie) — check with your pharmacist or midwife before taking anything new.
Nosebleeds and bleeding gums are also common from around this stage, as the increased blood volume and hormonal changes make the mucous membranes more sensitive and vascular. Neither requires treatment unless persistent or heavy; both are normal second-trimester experiences that most pregnancy guides don't mention until people are surprised by them.
The emotional character of week 15 is, for most people, a continuation of the relative calm and growing engagement of weeks 13 and 14. The anxiety has largely stepped back. The pregnancy has expanded to include more people. The physical changes are beginning to feel like a visible story rather than something happening entirely inside and out of sight. There is, for many people, a growing sense of reality — not just pregnancy-as-fact but pregnancy-as-approaching-event.
The anomaly scan — now about five weeks away — begins to take up some mental space this week. Not with the acute dread that preceded the 12-week scan, but with a quieter form of anticipation. The anomaly scan is the most detailed look at the baby's structure before birth, and it is also the scan where, if people want to find out, the sex is often visible. The approach of that appointment tends to prompt renewed thinking about the reality of the baby — who they might be, what they might be like, the beginning of imagining them as a specific person.
Fifteen weeks was when I started talking to them. Not in a performative way — not reading poetry to my bump — but just quietly, when I was alone. Walking home. Making dinner. I'd think something and then think it out loud, to them. It felt like the beginning of a conversation I've been having ever since.
Body image can become a more present consideration from around this stage. The body is changing visibly, and for some people that is straightforwardly joyful — the bump is a sign of what's happening, a welcome external confirmation. For others it is more complicated: old relationships with body shape and size, or a sense of loss of control over how the body looks and feels. Both responses are valid and very common. If you find body image is affecting your mood or self-esteem significantly, speak to your midwife — this is a legitimate topic for antenatal support, not a vanity concern.
The themes of week 15 connect to these full topic guides.
The second trimester continues to deepen the engagement of both of you with the pregnancy, and week 15 has a particular quality for partners: it is often where the baby begins to feel like a person rather than a concept. The visible physical changes, the approaching anomaly scan, the conversations beginning to turn toward names and personalities and what they might be like — all of these begin to make the pregnancy feel inhabited in a different way.
The 16-week appointment is next week, and whether or not you attend, it is worth knowing what it involves and asking about it. The heartbeat is often checked with a hand-held Doppler for the first time at this appointment — for many partners, hearing the heartbeat is the moment of fullest emotional arrival, more so even than the 12-week scan. If you can attend, do.
- The anomaly scan is five weeks away. Discuss with your partner whether you want to find out the sex. There is no right answer — but having the conversation before the appointment rather than in the moment is considerably less stressful.
- Body image may be emerging as a consideration. Your partner's body is changing visibly, and how they feel about that varies. Follow their lead: some people want their changing shape noticed and celebrated; others find the attention uncomfortable. Ask, rather than assuming.
- Notice what's different. The second trimester often brings a more equal distribution of presence and engagement in the pregnancy. Your partner is more able to be there, more accessible, more themselves. That is worth acknowledging and meeting with your own fuller engagement.
Prepare for your 16-week appointment — and know what to expect from it. The 16-week antenatal appointment is typically shorter than the booking and involves fewer clinical checks, but it is an important touchpoint and worth arriving at with questions prepared.
Combined screening results discussion — if your results from the 12-week scan are back, they will be discussed now. If you haven't received them yet, ask when to expect them.
Booking the anomaly scan — the 20-week scan is usually arranged at or around the 16-week appointment. Confirm the process and dates.
Foetal heartbeat — your midwife may use a hand-held Doppler to check the heartbeat. If they don't offer it and you'd like to hear it, ask.
Your questions — bring them written down. Any concerns from the past four weeks, symptoms you want to check, or questions about what's coming next.
As the anomaly scan approaches, this is the most useful question to ask your midwife at the 16-week appointment:
The anomaly scan is significantly more comprehensive than the 12-week dating scan — it checks the structure of the brain, heart, spine, kidneys, face, lips, abdomen, and limbs in detail. Not every abnormality can be detected, and a normal scan does not guarantee a perfectly healthy baby. But it is the most detailed external assessment available, and understanding what it covers — and what it doesn't — allows you to approach it with appropriate rather than inflated expectations.