Milestone Moments: How your child plays, learns, speaks, acts, and moves offers important clues about your child's development. Developmental milestones are things most children can do by a certain age. The Center for Disease Control and Prevention along with the American Academy of Pediatrics and others have complied a booklet of developmental milestone checklists and tips for parents for ages 2 months to 5 years. Copies are available at the library and a printable version is below in both English and Spanish. You may also download the CDC's free Milestone Tracker app from the App Store or Google Play store.