The American Academy of Pediatrics discourages media use, except for video chatting, by children younger than 18 months. If you introduce digital media to children ages 18 to 24 months, make sure it's high quality and avoid solo media use. For children ages 2 to 5, limit screen time to one hour a day of high-quality programming. See the resources below for more information:
ABCs of Screen Free Time at Home
Screen Time Handouts for Parents
Screen Time and Social Emotional Development
Screen Time and Language Development