Kidy
KidyGrow Tools
Free calculators and guides for pregnancy and the first years of parenting. Fast, simple, grounded in pediatric guidelines (WHO, ACOG).
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 favoritePregnancyDue Date Calculator
Enter the first day of your last period and cycle length, get your due date, current pregnancy week, trimester, and days remaining.
Open arrow_forward favoriteHealthBaby Growth Percentile, WHO
Calculate WHO percentiles for weight, length, and head circumference (0–5 years). Correction for premature babies built in.
Open arrow_forward bedtimeSleepBaby 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_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 restaurantFeedingBaby Feeding Amount
By age and weight, ml per feed, feeds per day, total daily formula (0–12 mo). AAP/WHO guidelines.
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_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_forwardComing soon
- 🍼 Nap transition calculator Q3 2026
- 🤱 Breastfeeding intake estimator Q3 2026
- 🩺 Vaccination schedule Q4 2026
What 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 official pediatric guidelines (WHO Child Growth Standards, ACOG, NHS).
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.
The algorithms are identical to the ones in the KidyGrow app, so what you see on the web matches what you'll see in the app when you start using it.
Which tool to use when
| Stage | Tool | What it shows |
|---|---|---|
| Pregnancy | Due Date Calculator | Due date, pregnancy week, trimester, days remaining |
| 0–24 mo | Wake Windows | Time between sleeps, total daily sleep, nap count |
| 0–5 years | Growth Percentile | WHO percentiles for weight, length/height, head circumference |