All models are wrong, but some are useful. A repository of baby guides

baby guides toddler

Famous aphorism, which originates from 1976, was mentioned by George Box when referring to statistical models. I find “All models are wrong, but some are useful” to be applicable to all the models in our lives, but especially to how we’re supposed to raise our kids.

Internet is full nowadays of guides about everything you need to know to raise a child. You’ll find in this article the most important mental and physical baby/toddler development info, so bookmark this page!

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Understanding Growth Standards for Children


The WHO Child Growth Standards were developed using data collected in the WHO Multicentre Growth Reference Study by the World Health Organisation. The site presents documentation on how the physical growth curves and motor milestone windows of achievement were developed as well as application tools to support implementation of the standards.

The below growth curves can guide you in the first 2 years of age:


Tracking Your Child’s First Major Gross Motor Milestones


As a first time parent I was concerned about how soon my baby girl managed to achieve the major motor milestones. The below chart sums up a comprehensive study by the World Health Organization. You’ll see that the windows of achievement are wide, there is no reason to be concerned if your baby is inside the window.

Motor development milestones
Tracking Your Child’s First Major Gross Motor Milestones

Reference: WHO Multicentre Growth Reference Study Group. WHO Motor Development Study: Windows of achievement for six gross motor development milestones. Acta Paediatrica Supplement 2006;450:86-95.


Tracking Mental Development Milestones in Children


I’ve mapped below the first 3 years of mental development milestones based on 3 famous books:

  1. The Wonder Weeks: A Stress-Free Guide to Your Baby’s Behavior
  2. Misbehavior is Growth: An Observant Parent’s Guide to the Toddler Years
  3. Misbehavior is Growth: An Observant Parent’s Guide to Three Year Olds



The Wonder Weeks: 10 major, predictable, age-linked changes – or leaps – during their first 20 months of babies’ lives:

baby milestones

Below is what Amber Domoradzki observed as childhood developmental stages:

toddler milestones

Toddler 3 years old

Creating a Healthy Sleep Schedule for Your Baby


I really like how Dr Marc Weissbluth advises In his book Healthy Sleep Habits, Happy Child, 5th Edition: A New Step-by-Step Guide for a Good Night’s Sleep to “watch your child, not the clock”, but still tells you to try and stick to a sleep schedule. A schedule will help you obtain healthy sleep patterns. You’ll baby will give you signs when she/he will be ready to have the sleep schedule adjusted.

Sleep schedule from baby to toddler
Creating a Healthy Sleep Schedule for Your Baby

I shared my experiences with sleep training in this article:


Navigating Sleep Regressions in Infants and Toddlers


Sleep regressions; I’m not sure how real they are, but be aware that they might happen:

Sleep regressions

A Step-by-Step Guide to Introducing Solids to Your Baby’s Diet

Introducing solids: the cheatsheet of baby food by months. You’ll find details in this article:

The cheatsheet of baby food by months

Immunization Schedule for Children 0-15 months old:


Find below immunization recommendations by the Centers for Disease Control and Prevention (CDC) for Ages 15 months old and younger . Some countries might provide the below vaccines for free based on the national vaccination schema:

Baby Vaccines


Encouraging Independent Play in Children


Solo play is encouraged and beneficial, but how long can our babies / toddlers play by themselves?

  • at 6 months up to 5 minutes
  • at 12 months 10 to 15 minutes
  • at 18 months up to 20 minutes
  • at 24 months up to 30 minutes

A full article on this here:



Are they all wrong? Well yes, it will not be 100% applicable to your child. Still, they’re useful. It’s reassuring to know what to expect and that difficult periods are normal.

Any comments are welcome

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Cristina Gurguta

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Welcome to! I’m Cristina, a Senior Machine Learning Operations Lead and a proud mom of two amazing daughters. Here, we help nurture your data science career and offer insane data-driven designs for shopping. Join us on this exciting journey of balancing work and family in a data-driven world!

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