Bornly guides
Useful answers, with the assumptions left in.
Practical guides that show the source, date, formula, uncertainty and next useful action.
6 guides
Caffeine and sleep
Free tool
Caffeine half-life calculator
Estimate how much caffeine may remain by bedtime, compare faster and slower clearance, and see every assumption behind the curve.
12 minute read
Caffeine and sleep: how late is too late?
Understand how caffeine timing and dose can affect sleep, how half-life estimates work, and how to build a cutoff that reflects your own response.
9 minute read
Caffeine half-life: how long does it stay in your body?
Learn what caffeine half-life means, why four hours is only a population average, and how to read a decay estimate without treating it as a measurement.
8 minute read
How long does caffeine last? A practical timeline
Follow a practical caffeine timeline from absorption to the long tail, with examples for common doses and guidance on interpreting lingering effects.
8 minute read
Caffeine before bed: how to choose a cutoff
Use dose, half-life, and repeated sleep observations to choose a caffeine cutoff instead of copying a universal rule.
9 minute read
How much caffeine can you have during pregnancy?
Understand the widely used 200 mg pregnancy guidance, how to count all caffeine sources, and why your clinician's advice takes priority.
8 minute read
How much caffeine is in coffee, tea, and energy drinks?
Compare caffeine sources, account for serving size, and learn how to record uncertain amounts when a measured value is unavailable.
6 guides
Choosing a baby name
Free tool
Baby-name shortlist builder
Browse verified place-and-year rankings, filter published fields, and keep a private shortlist in this browser.
13 minute read
How to choose a baby name you can both live with
A practical process for choosing a baby name: set constraints, read popularity correctly, compare privately, test the full name, and make the final decision.
9 minute read
How popular is too popular for a baby name?
Decide how much baby-name popularity matters to you by reading rank, count, place, year, spelling, and source limitations correctly.
8 minute read
How to choose a baby name with your partner
Use private first choices, mutual keeps, clear veto rules, and a small final shortlist to choose a baby name together without endless debate.
8 minute read
The full-name test: surname, initials, spelling, and everyday use
A practical full-name check for surname flow, initials, spelling, short forms, forms, and everyday speech.
8 minute read
Baby-name spellings, accents, spaces, and hyphens
Understand how official rankings treat spelling variants, accents, spaces, and hyphens, and why Bornly preserves separate source records.
8 minute read
How to build a useful baby-name shortlist
Turn a long baby-name discovery list into a useful shortlist with staged filters, mutual keeps, full-name checks, and a clear stopping rule.
6 guides
Pregnancy dates and weeks
Free tool
Pregnancy due-date calculator
Estimate a due date from LMP, cycle length, or IVF transfer, with the exact convention shown beside the result.
13 minute read
Pregnancy dates and weeks: what the numbers mean
Understand how pregnancy weeks and due dates are estimated, when LMP, ultrasound, or IVF dating takes priority, and why the result is not a birth prediction.
9 minute read
How pregnancy due dates are calculated
See the 280-day LMP convention, cycle-length adjustment, and IVF formulas, with the assumptions and clinical limits attached.
8 minute read
Pregnancy weeks and days: how gestational age is written
Understand gestational age notation such as 8+3, why “week nine” can be ambiguous, and how weeks are calculated from an established due date.
8 minute read
Pregnancy trimesters explained with exact week boundaries
See ACOG trimester boundaries in weeks plus days, understand why sources differ, and avoid treating calendar months as exact clinical units.
9 minute read
Ultrasound and due dates: when dating is most accurate
Learn how first-trimester ultrasound dates a pregnancy, what crown–rump length establishes, and why later scans rarely change the due date.
8 minute read
IVF due-date calculation from embryo transfer
Understand ACOG's IVF dating convention for day-3 and day-5 embryo transfer, why ART dating takes priority, and how to read the result.
6 guides
Gut health and symptom tracking
11 minute read
Gut health and symptom tracking, with appropriate limits
Learn what digestive symptom tracking can reveal, what it cannot diagnose, which bowel details are useful, and when to seek medical care.
9 minute read
How to track digestive symptoms simply
Build a useful digestive symptom diary with repeatable observations, manageable context, honest uncertainty, and a clear route to medical care.
9 minute read
The Bristol Stool Chart explained as a description, not a diagnosis
Understand the seven Bristol stool types, what stool form can help describe, where classification is uncertain, and what the chart cannot diagnose.
10 minute read
IBS symptoms and bowel patterns: what belongs in the picture
Understand the symptom pattern clinicians consider in IBS, how bowel habits can vary, what tracking contributes, and why diagnosis needs context.
10 minute read
Food triggers, elimination diets, and FODMAPs
Learn how to investigate possible digestive food triggers without confusing timing with proof or turning a short, guided restriction into a permanent diet.
9 minute read
Digestive red flags: when symptom tracking should stop
Recognize digestive warning signs that need prompt or emergency assessment, and learn how a short symptom record can support care without delaying it.
6 guides
Nutrition fundamentals
Free tool
Macro and TDEE calculator
Estimate adult resting and total daily energy expenditure, then convert an editable example macro split into transparent gram amounts.
12 minute read
Nutrition fundamentals: energy, macros, and the food behind the numbers
Understand calories, protein, carbohydrate, fibre, and fat using Nordic reference ranges while keeping food quality and individual context in view.
9 minute read
Calories, kilocalories, and energy balance explained
Learn what kcal and kJ measure, how food energy is calculated, why expenditure changes, and why energy balance does not describe diet quality.
10 minute read
BMR, RMR, and TDEE: what the calculator can actually estimate
See how resting energy and total daily expenditure are estimated from the Mifflin equation and activity levels, including every important limitation.
9 minute read
Protein fundamentals: reference ranges, grams, and food sources
Understand adult protein reference values, energy percentages, gram calculations, food sources, and the limits of a general macro target.
9 minute read
Carbohydrates, fibre, and sugars: keep the categories clear
Understand carbohydrate energy ranges, fibre guidance, free sugars, food-source quality, and why total carbohydrate alone is incomplete.
9 minute read
Dietary fat, saturated fat, and unsaturated fat in context
Understand adult fat reference ranges, why fat type matters, how grams are calculated, and why a total-fat target cannot describe the whole diet.
6 guides
Contractions and labor
Free tool
Web contraction timer
Record contraction starts and stops, review duration and start-to-start frequency, and keep urgent guidance visible.
12 minute read
Contractions and labor: what timing can and cannot tell you
Learn what contraction timing can show, why it cannot confirm labor, and which symptoms mean you should contact maternity care without waiting.
10 minute read
How to time contractions clearly
Learn when to press start and stop, how contraction frequency is measured, what trends matter, and when to stop timing and call maternity care.
10 minute read
Braxton Hicks vs labor contractions
Compare common Braxton Hicks and labor patterns, understand why symptoms can overlap, and know when uncertainty or warning signs deserve a call.
11 minute read
When to call about contractions
Know the contraction patterns and urgent symptoms that should prompt maternity contact, including broken waters, bleeding, reduced movement, and preterm signs.
10 minute read
The 5-1-1 contraction rule explained
Understand five minutes apart, one minute long, for one hour, why the pattern is only a general contact guide, and which symptoms override it.
11 minute read
Stages of labor: why there is no fixed timetable
Understand latent and established first-stage labor, birth and placental delivery, why progress varies, and when symptoms require prompt contact.
6 guides
Pregnancy milestones
Free tool
Pregnancy week calculator
Translate an established estimated due date into completed gestational weeks and days, trimester, and a broad milestone range.
13 minute read
Pregnancy milestones week by week
Follow broad pregnancy milestones by trimester, understand how gestational weeks are dated, and learn why development and care do not follow one exact calendar.
11 minute read
First trimester milestones
Follow broad first-trimester development from gestational dating through week 13+6, including implantation, early structures, and dating-scan context.
11 minute read
Second trimester milestones
Explore broad second-trimester growth, hearing and movement milestones, plus the timing and limits of the 20-week screening scan.
11 minute read
Third trimester milestones
Follow broad third-trimester maturation, movement and term milestones from week 28, with clear guidance for changed fetal movement.
11 minute read
Baby movement in pregnancy
Learn when fetal movement is commonly first felt, why each baby has an individual pattern, and when reduced, absent, or changed movement needs urgent contact.
11 minute read
Pregnancy scans and milestone dates
Understand the different purposes of dating and 20-week scans, what ultrasound can and cannot show, and why scan schedules vary by health system.
Reference library