Born – 21 years old

Month by month in the first two years, then year by year to adulthood. These are typical patterns, not tests. Every child moves through the same general sequence, each at their own pace.

Illustration of a baby, toddler, child, and teenager side by side, each with a glowing brain, growing from left to right
Calm years and rocky years are both normal. Children's behavior and mood naturally go up and down as new skills and demands arrive. Some stretches feel steadier and some more unsettled. A hard stretch is usually part of normal growth, but if it lasts weeks or affects sleep, eating, play, or school, talk with your child's doctor.

Birth to 2: month by month

Newborn

Growing

Connecting

Good to know

Ask your pediatrician if your baby isn't reaching milestones or loses skills they had. The CDC's free Milestone Tracker app can help you keep notes for visits.

Year by year: 3 to 21

Pick an age to see what's typical, what's normal even when it's hard, and when it's worth reaching out.

Your words matter at every age. See How we talk to our kids for what research shows and phrases to try.

At any age, it's worth talking to a professional if…

  • Your child's behavior or abilities seem very different from other children the same age.
  • Your child goes through a big change or a frightening experience, such as a loss, family upheaval, abuse, or a medical emergency.
  • Sadness or worry is severe or lasts for weeks.
  • You often feel disconnected from or stressed with your child, or you'd simply like support with discipline. Asking for parenting help is a strength.

Things nobody tells you about your baby

See all ten

Toddler years: autonomy, comfort, and calming take time.

Seven everyday habits for happy kids

These habits, inspired by Sean Covey's book The 7 Habits of Happy Kids, line up with skills research links to children's wellbeing: self-control, planning, empathy, cooperation, and healthy routines. Children learn them best by watching the adults around them. Tap a habit.

A large review of more than 200 school programs that teach these kinds of social and emotional skills found better behavior, fewer emotional difficulties, and higher grades (Durlak et al., 2011).

Why this matters: about half of all lifelong mental health conditions begin by age 14, and three-quarters by the mid-twenties. Childhood is when early, shame-free support can change the course. Why shame gets in the way

Ages 3 to 12 and the first-two-years milestones are adapted and paraphrased from Ray, D. C. (Ed.). (2016). A therapist's guide to child development: The extraordinarily normal years. Routledge. See Sources.

You don't have to wait until it's bad

These free US lines are for parents, partners, and anyone supporting them, during pregnancy and after.

Outside the US, contact your local emergency number or health service. If someone has confusion, hallucinations, or thoughts of harming themselves or the baby, call 911 or go to an emergency room.

Physical warning signs like chest pain, trouble breathing, a severe headache, or heavy bleeding during pregnancy or in the year after birth also need care right away. See urgent warning signs

Safety information in other languages: Español · Français · 中文 · Tiếng Việt · Italiano