Pregnancy week 16: on the doorstep of the first flutter

Butterfly, bubble, or little fish

Every woman describes the first movement differently — a butterfly in the belly, a bubble bursting, a little fish slipping past, something like gas that wasn't. The old English word for it is 'quickening'.

In first pregnancies it registers on average between weeks eighteen and twenty — there's no practice at recognising it, so it takes longer. Second time round, the same flutter is spotted at sixteen weeks or earlier.

So from this week, pay attention to the belly's soft static. And if nothing comes, don't calculate: an anterior placenta (visible on your scan) muffles everything, and nothing felt until week twenty-two is still normal. Beyond that, ask.

Your baby this week

The baby is guava-sized — eleven and a half centimetres, about a hundred grams. The next four weeks will more than double its weight — the speed era begins.

The eyes have begun slow movements behind sealed lids; the ears are nearly at their final places. Once the inner-ear bones harden in the coming weeks, sound arrives.

The hair pattern on the scalp — cowlick included — is set in this stretch. The heart pumps around fifty litres a day now, and the facial expressions grow more varied.

Changes in your body

The top of the uterus now sits between the pubic bone and the navel — the doctor may start measuring the bump each visit. That measurement (fundal height) tracks the weeks — the simplest growth gauge there is.

Low-back and hip pulls are regular companions now. The round-ligament twinge — on turning, sneezing, standing fast — continues; momentary and one-sided is its signature.

Constipation may return with force — the growing uterus slows the gut, and the iron tablet lends a hand. Water, fibre, walking — raise all three; straining invites piles, which pregnancy already tends toward.

What to do this week

Book the anomaly scan now — the window is 18-22 weeks and good centres fill early. It is pregnancy's most detailed and most important scan; skipping is not an option.

If starting belly-talk, this is the stretch — hearing begins in the coming weeks and yours will be the first voice recognised. Lullabies, chatter, reading — whatever comes naturally. The father's voice carries too; enlist him.

If the office doesn't know yet, tell them now — the bump will self-announce in weeks, and leave planning negotiated early always lands better.

Ask about the Td (tetanus-diphtheria) vaccine schedule — in India, given as two doses in pregnancy (or one booster, per your history), often starting this stretch. Free at the government centre, carded on the MCP.

Week 16 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 worsening pain, high fever, urinary burning, one-sided calf swelling: same-day.

A sudden gush or steady trickle of thin watery discharge — enough to wet clothing — is not ordinary discharge; leaking fluid needs same-day assessment. Normal discharge is thicker and builds gradually.

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: I felt something flutter, then nothing for two days — worry? — No. At this stage daily movement isn't expected — the baby is small and you are busy. The daily-count rule starts at week 28, not now.

Q: The flutters are very low in my belly — why so low? — Because that's where the uterus still is. The baby rises over the months, and the flutters with it. Low is exactly right for now.

Q: What does the anomaly scan actually check? — Every organ, head to toe: brain structures, face, spine, all four heart chambers, stomach, kidneys, limbs — plus the placenta's position, fluid volume and the cervix. That's why it takes its time, and why its date is sacred.

Q: Does music make the baby smarter? — The 'smarter' claim is marketing. But sounds do reach, and newborns recognise womb-heard tunes. Play it as bonding — not as tuition.