Pregnancy and baby
Dates, weeks and trimesters counted from a period or an embryo transfer, a feeding timer and a weight log — all arithmetic on dates and weights you enter, on a desk that says plainly what it is not.
Every figure on this desk is calendar arithmetic. A due date is 280 days from the first day of the last period, or a fixed number of days from an IVF transfer depending on the embryo’s age; a week count is the days since that start divided by seven; a trimester boundary is a fixed day number. None of those is a measurement of your pregnancy. When a scan has dated it, the scan’s date is the one to use, and the page will work back from whatever due date you give it.
Where a number belongs to a person rather than to a calendar, the page asks for it and does not supply one. Weight gain is compared only with the range your own chart states, and stays uncompared until both ends are entered. Ovulation and fertility windows follow the arithmetic of a cycle length you enter and say in the same breath that a calendar is not a fertility test, not a contraception, and not a substitute for a clinician’s reading of your cycle. The feeding timer measures time and nothing else — not intake, not adequacy, not a schedule.
So nothing here assesses you or your baby. There are no percentiles, no “normal” readings, no target weight and no advice on when a pregnancy should end; those are clinical judgements that need an examination, a growth chart and a history this page cannot see. Every page carries the same note: this is arithmetic, not antenatal care, and a dating scan, a growth chart and a clinician’s advice take precedence over every figure on it.
What the desk does keep is its own record keeping. The feeding log and every sheet are built in the browser, printed from it and never uploaded or stored; closing the page clears the timers and the entries. A printed sheet persists, so it should be treated like any other record of a baby’s day or a pregnancy, and kept accordingly.
Every tool in Pregnancy and baby
- Pregnancy due date calculator An estimated due date counted 280 days from the first day of your last period, adjusted for a cycle that is not 28 days, with the convention printed.
- Pregnancy week calculator How many weeks and days pregnant you are today, counted from the first day of your last period, and how many days are left to the estimated due date.
- Pregnancy month calculator The pregnancy month you are in and the calendar months completed since the first day of your last period — because a pregnancy month is not four weeks.
- Conception date calculator An estimated conception date worked back 266 days from a due date, or forward from the last period — a single arithmetic point, not a measurement.
- Ovulation calculator The estimated ovulation day in the current or next cycle and the date the next period is due, from your own cycle length — with the warning that this is not a contraceptive method.
- Fertility window calculator A dated list of the estimated fertile window for the next few cycles, using five days before to one day after the estimated ovulation — a convention, not a measurement, and never a contraceptive.
- IVF due date calculator A due date from an embryo-transfer date, allowing for the age of the embryo at transfer — 263 days for a day-3 embryo, 261 for a day-5 blastocyst.
- Trimester calculator The trimester you are in, the day the next one begins and the days between, on a stated boundary convention — first ends at week 13, second at week 27.
- Baby age calculator A baby's age in calendar months and days, in weeks and days, and in total days, counted from the date of birth to any date you choose.
- Baby growth calculator The change between two weighings: grams gained a day and a week, and the number of days between them — not a percentile and not a growth chart.
- Baby feeding schedule calculator A printable layout of feed times from a start time and a gap you supply — a way to write down times, not a schedule to impose on a baby.
- Breastfeeding time tracker A pair of timers for a feeding session, the time on each side, the last session and a log you can read back — kept in this browser tab and nowhere else.
- Pregnancy weight gain calculator The weight gained since before pregnancy and the week you are in, compared with the range your own clinician marked — no target is published on this page.
- Gestational age calculator The gestational age on any date, worked back from a due date you have been given rather than forward from a period.
- Pregnancy milestone calculator A dated sheet of the trimester boundaries, the halfway point and the due date, counted from the first day of your last period and printed in order.