Dr. Sandro Cantoni. Pediatrician. At every age, your infant and toddler play, learn, talk, and move. Seeing when and how it does these things is critical. Because from this you can know if the baby’s development is normal or not. This observation of development can be done by any parent just fine. It’s not a … Continue reading 18 Month-old Toddler. Milestones and Signs of Delay.