Milestones are conversation starters, not tests. This guide walks through the developmental checkpoints most families are watching between birth and age five — the ones pediatricians ask about at well-visits — and links each one to activities that gently support that skill. Every child grows on their own timeline; the point is to notice, not to score.
The four domains
Modern child-development frameworks (CDC, WHO, AAP) group milestones into four domains: Movement and Physical (rolling, crawling, walking, climbing, drawing), Language and Communication (cooing, first words, sentences, following instructions), Social and Emotional (attachment, self-regulation, play with peers), and Learning and Thinking (object permanence, cause-and-effect, pretend). Pip's milestone tracker uses these four domains, one card per checkpoint per child.
The 12 checkpoints (2 months to 5 years)
Pediatric well-visits check in at roughly 2, 4, 6, 9, 12, 15, 18, 24, 30, 36, 48 and 60 months. At each one, watch for a small handful of skills that most children in that band have started to show. The milestone tracker in Pip pre-loads the checklist for the right checkpoint based on your child's birthday and lets you check off, note details, and print a pediatrician handoff.
What to watch for at each stage
Rough shape: 2–6 months = social smile, tracking, cooing, head control. 6–12 months = sitting, first words, object permanence, waving. 12–24 months = walking, 10+ words, pointing, simple pretend. 24–36 months = short sentences, running, sorting, big feelings. 3–5 years = full sentences, drawing a person, taking turns, pretend narratives, early counting. The full checklist is far more detailed and lives inside the tracker.
Activities that support each milestone
Pip maps every activity to the specific milestones it supports. If your 15-month-old is working on pointing and first words, the tracker suggests activities tagged for that exact skill window — no scrolling, no guessing. Same for gross-motor milestones like climbing, or fine-motor milestones like pincer grasp.
When to talk to a pediatrician
If your child has lost skills they used to have, is not meeting most of the milestones in a checkpoint after a couple of months, or something just feels off — talk to your pediatrician. Early intervention is one of the most well-studied levers in child development, and it is always free to ask.
Frequently asked questions
What are developmental milestones?
Developmental milestones are the skills most children learn by a certain age — like rolling over, first words, or drawing a circle. They come from research on typical development and are used by pediatricians as a rough guide, not a test.
At what ages should I check milestones?
The standard well-visit checkpoints are 2, 4, 6, 9, 12, 15, 18, 24, 30, 36, 48 and 60 months. Pip's tracker mirrors those exact checkpoints.
What if my child isn't hitting a milestone?
One late milestone is not a diagnosis. Two or three in the same domain, or the loss of skills your child used to have, is worth a pediatrician conversation.
Is the checklist free?
Every family can preview the milestone checklist for their child's current checkpoint. Pip Plus unlocks the full per-child tracker across every age band, saved history, the printable pediatrician handoff, and the growth-chart tools.