Baby & Parenting
Baby Age Calculator
Your baby’s exact age in weeks, months and days, plus adjusted age for premature babies.
Age = today − date of birth (corrected ag…
Also called how old is my baby · baby age in weeks
Health & Fitness · 7 calculators
Baby & Parenting Calculators
Baby age in weeks and months, feeding intervals, formula amounts, diaper usage and sleep needs by age.
Baby & Parenting
Baby Feeding Interval Calculator
Feeds per day and the schedule of next feeds from the interval between feeds and your baby’s age.
Feeds per day = hours in day ÷ interval
Also called feeding schedule · how often to feed baby
Baby & Parenting
Baby Formula Calculator
Daily and per-feed formula amounts by baby weight, using the standard 150 ml per kg per day guideline.
≈ 150 ml of formula per kg of body weight…
Also called how much formula · formula feeding amounts
Baby & Parenting
Diaper Usage Calculator
How many nappies your baby will use per week, month and until potty training — with the cost.
Monthly = per day × 30.4
Also called nappy calculator · diapers per month
Baby & Parenting
Baby Sleep Calculator
Recommended total sleep, naps and wake windows for babies and toddlers by age.
Based on published sleep-duration guideli…
Also called baby sleep schedule · how much sleep does my baby need
Baby & Parenting
Baby Weight Gain Calculator
Weight gain per day, week and month between two weigh-ins, and the percentage change from birth weight.
Gain per day = (current − birth weight) ÷…
Also called baby growth calculator · infant weight gain
Baby & Parenting
Age Calculator
Exact age in years, months and days from a date of birth, with the next birthday countdown.
Count whole years, then months, then rema…
Also called how old am i · date of birth calculator
Key baby & parenting formulas
| Baby Age | Age = today − date of birth (corrected age subtracts weeks born early) |
|---|---|
| Baby Feeding Interval | Feeds per day = hours in day ÷ interval |
| Baby Formula | ≈ 150 ml of formula per kg of body weight per day |
| Diaper Usage | Monthly = per day × 30.4 |
| Baby Sleep | Based on published sleep-duration guidelines by age |
| Baby Weight Gain | Gain per day = (current − birth weight) ÷ days |
| Age | Count whole years, then months, then remaining days |
Baby & Parenting questions
How is age calculated exactly?
By counting completed years since birth, then completed months, then leftover days — not by dividing total days by 365.