Baby Milestone Tracker
Track your baby's developmental milestones from 2 to 24 months. Based on the CDC's Learn the Signs. Act Early checklists (2022 revision), with guidance from the American Academy of Pediatrics. Check off milestones as your baby achieves them, add notes, and export your progress as CSV.
Understanding Baby Developmental Milestones
Developmental milestones are behaviors and skills that most children can do by a certain age. The CDC's Learn the Signs. Act Early program provides evidence-based milestone checklists covering four developmental areas: social/emotional, language/communication, cognitive (learning, thinking, problem-solving), and movement/physical development. In 2022, the CDC updated these checklists in collaboration with the American Academy of Pediatrics to reflect milestones that most children (at least 75%) reach by each age, making them more useful for identifying potential delays.
How This Tracker Works
This tool pre-loads the CDC milestone checklists for 8 age groups from 2 months through 24 months. Each milestone is organized by age first, then by developmental category. Check off milestones as your baby demonstrates them — the date is automatically recorded and you can add notes about when and how each milestone appeared. If you enter your baby's birthday, the tracker highlights the current age group so you can focus on the most relevant milestones. Your progress is tracked with overall and per-age-group counts and progress bars.
When to Talk to Your Doctor
The CDC and AAP recommend formal developmental screening at the 9-month, 18-month, and 24 or 30-month well-child visits. Autism-specific screening is recommended at 18 and 24 months. However, you should talk to your child's doctor any time you have concerns. Missing a single milestone is not necessarily a cause for alarm — every child develops at their own pace — but consistent delays across multiple areas or missing several milestones within an age group is worth discussing with your pediatrician. Early identification of developmental delays leads to earlier intervention, which research consistently shows produces better outcomes.
Exporting and Sharing Your Data
Use the Export CSV button to download your milestone tracker as a spreadsheet-friendly file. This can be helpful to share with your pediatrician at well-child visits, or to keep as a personal record of your baby's development. The CSV includes the age group, category, milestone description, achieved status, date achieved, and any notes you have added. You can also import a previously exported file to restore your data on a new device.
Frequently Asked Questions
What milestones are included in this tracker?
This tracker includes milestones from the CDC's Learn the Signs. Act Early checklists (2022 revision) for 8 age groups: 2 months, 4 months, 6 months, 9 months, 12 months, 15 months, 18 months, and 24 months. Each age group covers four developmental categories: social/emotional, language/communication, cognitive, and movement/physical development. There are approximately 100 milestones total.
Should I be worried if my baby has not reached a milestone?
Not necessarily. The CDC's 2022 updated milestones represent what most children (approximately 75%) can do by each age. Some children develop certain skills earlier or later than the typical range. However, the American Academy of Pediatrics recommends discussing any concerns with your pediatrician, especially if your child is missing multiple milestones or showing a pattern of delays across categories. You know your child best — if something feels off, do not wait. Talk to your doctor.
When should developmental screening happen?
The CDC and AAP recommend standardized developmental screening at the 9-month, 18-month, and 24 or 30-month well-child visits. Autism-specific screening is recommended at 18 and 24 months. Additional screening should happen any time a parent or provider has a concern. You can use this tracker to prepare for those visits by reviewing which milestones your baby has and has not reached.
Is my data saved?
Yes. Your milestone data and birthday are saved in your browser's local storage on your device. Data persists between sessions with no account required. No data is sent to a server. You can export to CSV for backup or to share with family or your pediatrician. There are no accounts, no sign-ups, and no usage limits.
Can I add custom milestones?
Yes. Each age group has an "Add milestone" row where you can type a custom milestone and select which developmental category it belongs to. You can also delete any default milestone that does not apply to your situation. Custom milestones are saved alongside the CDC defaults and included in CSV exports.
What changed in the 2022 CDC milestone update?
In February 2022, the CDC revised its developmental milestone checklists for the first time in nearly two decades. The update was made in collaboration with the AAP and shifted milestones from what "most children" can do to what at least 75% of children can do by each age. This makes the checklists more actionable — if a child has not reached a milestone, it is a clearer signal to discuss with a healthcare provider. The update also added new age checkpoints at 15 and 30 months.