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Bornly guides

Useful answers, with the assumptions left in.

Deep, practical guides for decisions that deserve more than a thin summary. We show the source, date, formula, uncertainty, and next useful action.

42in-depth guides

6free primary tools

Primarysources preferred

01 · 6 guides

Caffeine and sleep

A practical, source-backed guide to caffeine dose, timing, half-life, sleep, and the limits of any estimate.

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Caffeine half-life, without the misleading countdown How long does caffeine last? A practical timeline Caffeine before bed: how to choose a cutoff Caffeine during pregnancy: understanding the 200 mg guidance How much caffeine is in coffee, tea, and energy drinks?Free toolCaffeine half-life calculator

02 · 6 guides

Choosing a baby name

A calm, practical guide to building a shortlist, reading popularity data, comparing choices with a partner, and testing the full name.

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How popular is too popular for a baby name?How to choose a baby name with your partner The full-name test: surname, initials, spelling, and everyday use Baby-name spellings, accents, spaces, and hyphens How to build a useful baby-name shortlist Free toolBaby-name shortlist builder

03 · 6 guides

Pregnancy dates and weeks

A source-backed guide to estimated due dates, gestational weeks, trimesters, ultrasound dating, and IVF dating.

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How pregnancy due dates are calculated Pregnancy weeks and days: how gestational age is written Pregnancy trimesters explained with exact week boundaries Ultrasound and due dates: when dating is most accurate IVF due-date calculation from embryo transfer Free toolPregnancy due-date calculator

04 · 6 guides

Gut health and symptom tracking

A practical, medically bounded guide to digestive symptoms, bowel patterns, food observations, and knowing when tracking should give way to care.

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How to track digestive symptoms simply The Bristol Stool Chart explained as a description, not a diagnosis IBS symptoms and bowel patterns: what belongs in the picture Food triggers, elimination diets, and FODMAPs Digestive red flags: when symptom tracking should stop

05 · 6 guides

Nutrition fundamentals

A source-backed guide to energy, protein, carbohydrate, fibre, and fat, with a transparent adult macro and daily energy expenditure calculator.

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Calories, kilocalories, and energy balance explained BMR, RMR, and TDEE: what the calculator can actually estimate Protein fundamentals: reference ranges, grams, and food sources Carbohydrates, fibre, and sugars: keep the categories clear Dietary fat, saturated fat, and unsaturated fat in context Free toolMacro and TDEE calculator

06 · 6 guides

Contractions and labor

Source-backed guidance on contraction timing, early labor, Braxton Hicks contractions, the 5-1-1 pattern, and when to call for care.

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How to time contractions clearly Braxton Hicks vs labor contractions When to call about contractions The 5-1-1 contraction rule explained Stages of labor: why there is no fixed timetable Free toolWeb contraction timer

07 · 6 guides

Pregnancy milestones

A source-backed pregnancy timeline covering trimester development, fetal movement, dating, scans, term categories, and the limits of milestone dates.

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First trimester milestones Second trimester milestones Third trimester milestones Baby movement in pregnancy Pregnancy scans and milestone dates Free toolPregnancy week calculator

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