Milestone Tracker Calculator
See expected developmental milestones for your baby's age, including motor, language, social, and cognitive skills based on CDC guidelines.
Results
Visualization
How It Works
Developmental milestones are skills most children reach by a certain age, based on CDC guidelines. They cover four areas: motor (movement), language (communication), social/emotional, and cognitive (thinking). Every child develops at their own pace. Not medical advice -- talk to your pediatrician if you have concerns.
The Formula
Milestones are age-based ranges, not exact dates:
2 mo: smiling, head lifts | 4 mo: reaching, babbling
6 mo: sitting, rolling | 9 mo: crawling, "no" understanding
12 mo: first words, walking | 18 mo: running, simple words
2 mo: smiling, head lifts | 4 mo: reaching, babbling
6 mo: sitting, rolling | 9 mo: crawling, "no" understanding
12 mo: first words, walking | 18 mo: running, simple words
Variables
- CDC milestones — Skills most children (75%+) achieve by a given age
- Adjusted age — For preemies, subtract weeks born early
Example
6-month-old: should be rolling both ways, sitting with support, babbling vowel sounds, bringing things to mouth.
Tips
- Milestones are ranges, not deadlines -- some babies walk at 9 months, others at 15 months
- Tummy time strengthens muscles needed for rolling, sitting, and crawling
- Talk and read to your baby from day one to support language development
- If your baby is not meeting milestones, early intervention can make a big difference
- Contact your pediatrician if you notice loss of previously acquired skills