Kidy
KidyGrow Tools
Free calculators and guides for pregnancy and the first years of parenting. Fast, simple, and grounded in guidance from the WHO, CDC, AAP and ACOG.
pregnant_womanPregnancy
bedtimeSleep
Baby Wake Windows by Age
Slide through ages 0–24 mo to see typical wake windows, total daily sleep, and how many naps are common at each stage.
Open arrow_forward bedtimeSleepBaby Sleep Schedule by Age
Enter the wake-up time, age, and number of naps to get suggested nap windows, a bedtime range, and an overtiredness check.
Open arrow_forwardrestaurantFeeding
Baby Feeding Amount
By age and weight, ml per feed, feeds per day, total daily formula (0–12 mo). Based on AAP guidance.
Open arrow_forward restaurantFeedingBaby Feeding Schedule by Age
A sample day for 6–12 mo: milk feeds, solid meals, and naps laid out hour by hour from your baby's age and milk feeds.
Open arrow_forward restaurantFeedingBaby Food Introduction Planner
Track which allergens are in and get the next one to try, plus age-right textures, iron-rich foods, and what to skip (6–12 mo).
Open arrow_forwardfavoriteGrowth and health
Baby Growth Percentile, WHO
Calculate WHO percentiles for weight, length, and head circumference (0–5 years). Correction for premature babies built in.
Open arrow_forward child_careDevelopmentBaby Tooth Eruption Timeline
Enter the child's age, the calculator shows the typical number of primary teeth, which have come in and which are next (0–36 mo).
Open arrow_forward favoriteHealthBaby Poop Color Guide
8 typical stool colors with explanations by feeding type. When it's normal, when to watch, when to call the pediatrician urgently.
Open arrow_forwardextensionDevelopment and play
Developmental Milestones by Age
Tick what your child already does (2 months–5 years) and get a gentle, non-diagnostic read across social, language, thinking, and movement. Based on the CDC checklist.
Open arrow_forward extensionActivitiesDevelopmental Activity Finder
Filter activities by age, goal (speech, motor, emotional, sensory), time, and materials, each with why it helps, difficulty, and step-by-step.
Open arrow_forward travel_exploreDiscoveryDiscovery Cards
Why do cats purr? Short, true answers to the big "why" questions little kids ask, each with a fun fact, a tiny activity, and a question to talk about together. Twenty worlds so far, from animals and space to feelings and machines.
Open arrow_forward auto_storiesStoriesBedtime Story Library
Gentle, educational stories where your child is the hero and Growy is their friend. Add a name, read along, and finish with a talk-together prompt and activity.
Open arrow_forwardMore on the way
New tools go up when they are finished, not on a roadmap date. Each one starts from a question parents keep asking, so if something you need is missing, it is probably already on the list.
Meanwhile, the app covers the daily stuff arrow_forwardWhat KidyGrow Tools are
Quick, simple calculators for the questions parents ask most often during pregnancy and early parenthood. Every tool runs in the browser, requires no signup, and is built on published guidance: WHO Child Growth Standards for percentiles, CDC milestone checklists, AAP and NHS for feeding and sleep, ACOG for pregnancy dating.
Results are a reference, not a diagnosis. The goal is to give you a real-world reference between visits to the pediatrician or OB-GYN, no panic, no confusion. All three languages (English, Croatian, Spanish) share the same compute logic, only with localized examples and units.
Where a tool does the same calculation as the KidyGrow app, growth percentiles and wake windows for example, it runs the same logic, so the numbers line up. The app then adds the part a page cannot: it remembers your child's own days and adapts to them.
Which tool to use when
| Stage | Tool | What it shows |
|---|---|---|
| Pregnancy | Due Date Calculator | Due date, pregnancy week, trimester, days remaining |
| 0–12 mo | Feeding Amount | Millilitres per feed, feeds per day, daily total |
| 0–24 mo | Wake Windows | Time between sleeps, total daily sleep, nap count |
| 0–24 mo | Sleep Schedule | Nap windows, a bedtime range, an overtiredness check |
| 0–36 mo | Tooth Eruption | Teeth in so far and which ones come next |
| 0–5 years | Growth Percentile | WHO percentiles for weight, length/height, head circumference |
| 2 mo–5 years | Milestones Checklist | A non-diagnostic read across four developmental areas |
| 6–12 mo | Food Introduction Planner | Allergens covered, textures, what to skip |
| Any age | Poop Color Guide | Normal, worth watching, or call the pediatrician |
| Toddler and up | Discovery Cards, Stories, Activities | Answers to "why", bedtime stories, play ideas by goal |
Common questions about the tools
Are the KidyGrow tools free?
Yes. Every calculator and guide runs in your browser, with no signup, no account, and no paywall. Nothing you type is sent anywhere or stored.
Which guidelines are the calculators based on?
It depends on the tool. Growth percentiles use the WHO Child Growth Standards, the milestones checklist follows the CDC checklist, feeding and sleep ranges follow AAP and NHS guidance, and due dates use Naegele's rule as published by ACOG. Each tool names its sources on its own page.
Do the tools work in Croatian and Spanish?
Yes. Every tool exists in English, Croatian and Spanish, with the same calculation behind it. Only the examples, units and wording are localized. The Croatian version also has a vaccination and check-up calendar built on the HZJZ programme.
Can a calculator replace the pediatrician?
No, and none of them try to. They give you a reference point between visits so you can ask a better question, not an answer to act on alone. If a result worries you, or your child seems unwell, call your pediatrician.
Do I need the app to use the tools?
No. The tools are complete on their own. The app does the part a page cannot: it remembers your child's own days and adapts to the pattern instead of showing you an average.