Pregnancy week 18: the anomaly scan window opens

Forty minutes of close attention

This scan has many names — anomaly scan, TIFFA, level II — and one job: examining the baby head to toe. Brain chambers, facial structure, every vertebra, the heart's four chambers, stomach, kidneys, limbs — all measured and counted.

Your side gets checked too: where the placenta sits, how much fluid there is, the cervix's length. This scan is the map for the whole road ahead — which is why it never goes on the skip list.

And one thing said plainly, because the question still gets asked in scan rooms: this scan can see the baby's sex, and in India asking or telling is a crime under the PCPNDT Act. The sonographer won't say, and asking puts them in an impossible position.

Your baby this week

The baby is capsicum-sized — fourteen and a half centimetres, about two hundred grams. And this week's loveliest fact: a sleep-wake cycle now runs — the baby sleeps and wakes on schedule, often the opposite of yours.

The ears are in place outside and working within — loud sounds startle, rhythm soothes. Your voice arrives clearest of all — not through the fluid but through your bones, by direct line.

In girl babies, a remarkable thing this stretch: the ovaries already hold a lifetime's supply of eggs. In a sense, half of your future grandchild is present too.

Changes in your body

The bump no longer hides — and the hands-on-belly askers arrive in queues. If being touched isn't welcome, saying so is entirely allowed — this is your body, not an etiquette test.

Appetite runs at full throttle. Feed it from the kitchen, not the packet — fried and sugary snacks fill the stomach but skip the baby's trio (iron, calcium, protein).

Mild breathlessness may start — more blood to move, and a rising uterus. Taking stairs in instalments is wisdom, not weakness.

What to do this week

The anomaly scan between now and week 22 — if the date has arrived, the prep is simple: previous reports in the file, arrive on time, two-piece clothing for the gel. A full bladder usually isn't needed now, but follow the centre's instruction.

If the report says 'low-lying placenta', don't panic — it's common at this stage and most placentas 'migrate' up as the uterus grows. The doctor rechecks around week 32; any restrictions meanwhile come from them.

If the first Td dose hasn't happened, this stretch is its time — free at the centre, onto the MCP card.

Circle the 9th of every month — the PMSMA camp gives free specialist antenatal checks at government centres. Even with private care running, that option stays open.

Week 18 at a glance

The week's essentials in one place. Your doctor may adjust these for your situation.

When to see a doctor at once

The standing list — bleeding, persistent pain, high fever, urinary burning, sudden watery discharge, calf swelling: same-day.

If the scan flags something 'worth watching', rule one: do not google the report's words overnight. Sonographer language casts a wide net, and most of what it catches turns out to be nothing. Take the report to your doctor — interpretation is their job.

This article is general information only and no substitute for personal medical advice. The person who can advise you knowing your health, your medicines and your previous pregnancies is your obstetrician, or the doctor at your nearest health centre.

Work out your due date

Enter the first day of your last period and your cycle length — your estimated due date, this week's count and the anomaly scan window all appear right here.

It is only an estimate — most babies aren't born on the exact date. A first-trimester scan dates a pregnancy more accurately; in the end, your doctor's date is the one that counts.

Frequently asked questions

Q: The scan came back normal — so everything is guaranteed fine? — It catches most structural problems, but no scan sees everything. 'Normal' means all that could be seen was fine. That is big, good news; take it as exactly that.

Q: The baby 'wouldn't cooperate' and we were called back — bad sign? — Routine. Some heart or spine views need the baby's right angle; if it won't turn, you walk, or return another day. It's diligence, not bad news.

Q: The baby moves at night and sleeps all day — why? — Your daytime walking rocks it to sleep; when you lie down, the cradle stops and it wakes. Consider it advance notice of the newborn timetable.

Q: Heartburn has started — should I eat less? — Not less; differently. Small frequent meals, less fried and spiced, no lying down right after eating, head end raised at night. If it persists — the doctor has pregnancy-safe options; skip the self-prescribed soda.