Indicator	Subdomain	Developmental stage	Data source	Definition by data source and notes	Years available and periodicity
Child indicators
Cognitive/language development	N/A	Infant/toddler	NSCH	Is this child able to do the following…? Say at least one word, such as “hi” or “dog.” Use 2 words together, such as “car go.” Use 2 words together, such as “car go.” Use 2 words together, such as “car go.” Use 3 words together in a sentence, such as, “Mommy come now.” Ask questions like “who,” “what,” “when,” “where.” Ask questions like “why” and “how.” Tell a story with a beginning, middle, and end. Understand the meaning of the word “no.” Follow a verbal direction without hand gestures, such as “Wash your hands.” Point to things in a book when asked. Follow 2-step directions, such as “Get your shoes and put them in the basket.” Understand words such as “in,” “on,” and “under.” Notes: Major redesign in 2016, including new sampling method. These questions were asked to children ages 1–5 years only.	2016–present Annual
Developmental delays	N/A	Infant/toddler	NSCH	Has a doctor, other health care provider, or educator EVER told you that (fill with CHILD’S NAME) has…Developmental Delay? Examples of educators are teachers and school nurses. [Yes; No] Notes: Major redesign in 2016, including new sampling method.	2016–present Annual
Family/caregiver indicatorsa
Developmental surveillance	N/A	Infant/toddler	NSCH	During the past 12 months, did this child’s doctors or other health care providers ask if you have concerns about this child’s learning, development, or behavior? [Yes; No] Notes: This is the often-forgotten half of the AAP guidance. Screening is not as effective without this surveillance. Major redesign in 2016, including new sampling method.	2016–present Annual
Developmental screening	N/A	Infant/toddler	NSCH	During the past 12 months, did a doctor or other health care provider have you or another caregiver fill out a questionnaire about observations or concerns you may have about this child’s development, communication, or social behaviors? Sometimes a child’s doctor or other health care provider will ask a parent to do this at home or during a child’s visit. [Yes; No] Notes: Available for ages 10 months – 3 years. Major redesign in 2016, including new sampling method.	2016–present Annual
Reading to children	N/A	Infant/toddler	NSCH	During the past week, how many days did you or other family members read to this child? [0 days; 1–3 days; 4–6 days; Every day] Notes: Major redesign in 2016, including new sampling method.	2016–present Annual
Singing and telling stories	N/A	Infant/toddler	NSCH	During the past 12 During the past week, how many days did you or other family members tell stories or sing songs to this child? [0 days; 1–3 days; 4–6 days; Every day] Notes: Major redesign in 2016, including new sampling method.	2016–present Annual
Screen time	N/A	Infant/toddler	NSCH	2018: ON MOST WEEKDAYS, about how much time did this child spend in front of a TV, computer, cellphone or other electronic device watching programs, playing games, accessing the internet, or using social media? [Less than 1 h; 1 h; 2 h; 3 h; 4 or more hours] 2016–2017: ON AN AVERAGE WEEKDAY, about how much time does (fill with CHILD’S NAME) usually spend in front of a TV watching TV programs, videos, or playing video games? [None; Less than 1 h; 1 h; 2 h; 3 h; 4 or more hours] 2016–2017: ON AN AVERAGE WEEKDAY, about how much time does (fill with CHILD’S NAME) usually spend with computers, cell phones, handheld video games, and other electronic devices, doing things other than schoolwork? [None; Less than 1 h; 1 h; 2 h; 3 h; 4 or more hours] Notes: Major redesign in 2016, including new sampling method.	2016–present Annual

^aMany of the family/caregiver indicators are related to multiple domains, but to streamline this manuscript, we placed the indicators in the most aligned domain