Screen time under two: what the research actually says.

The guidance

The American Academy of Pediatrics’ position, unchanged since 2016: under 18 months, avoid screens other than video-chatting. From 18 to 24 months, parents who want to introduce media should choose high-quality programming and watch it with the child. From two to five, limit screen use to one hour a day of high-quality content, co-viewed.¹

The World Health Organization is stricter at the bottom: no sedentary screen time at all before age one, and none recommended at one; for two- to four-year-olds, no more than an hour a day, and “less is better”.²

What the studies found

Babies do not learn language from recordings

The clearest experiment is Patricia Kuhl’s. Nine-month-old American babies were exposed to Mandarin over twelve sessions — some from a live person in the room, some from the same person on video, some from audio only. The babies who met a live person learned to hear Mandarin’s sound contrasts. The video and audio groups learned nothing measurable.³ Same words, same voice, same minutes. The difference was a person.

Baby videos went with fewer words, not more

In a survey of over a thousand families, every hour a day of “baby DVDs” watched by 8-to-16-month-olds was associated with knowing six to eight fewer words on the standard vocabulary inventory.⁴ It is a correlation, not a proof of cause — but it is the opposite direction from the one the products promised.

More screen time at two predicted lower scores at three

A study of 2,441 children measured screen time at 24, 36 and 60 months and ran developmental screening at each age. Higher screen time at 24 months predicted poorer performance on the screening at 36 months, and higher screen time at 36 months predicted poorer performance at 60 months. The reverse was not true — lower scores did not predict more screen time later — which points the arrow from screens to development, not the other way.⁵ The effects were small, and the study is about hours a day, not minutes.

The exception: a live person on a video call

Toddlers of 24 to 30 months learned new verbs from an adult on video chat — when the adult could see them and respond to them in real time. Given the same adult on a recording that could not respond, they learned nothing.⁶ This is the study behind the AAP’s video-chat exception, and it is why a grandmother on FaceTime is not “screen time” in the sense the guidance means. What teaches is the responding.

What this means for an app like ours

Honestly: a flashcard app is a screen, and a baby under 18 months will not learn words from it. The evidence says a baby learns words from a person naming what the baby is looking at, and that is the only thing the app is for — a picture and a native voice for the parent to copy, so the parent can say the word in a language they may not speak well. If the child is watching the phone and the parent is not talking, the app is doing the thing the studies warn about.

So the app is built around the guidance rather than against it:

• One card at a time. No scroll, no feed, no autoplaying next thing. Auto Play is off by default and stays off unless a parent turns it on for that session.
• No rewards, no streak guilt, no points. Nothing is designed to keep a child looking.
• No ads, no external links a child can reach.
• It is meant to be held by the adult. The card faces the child; the word comes from you. Two minutes is a session; the WHO’s “less is better” applies to us too.
• It prints. If you would rather keep the phone in your pocket, the free cards are on paper, and the guidance above stops applying.

A workable set of house rules

• Under 18 months: video calls with people who love them, and nothing else. Let the grandparent see the toy; the responding is the point.
• 18 months to two: if you use a screen, use it together, name what is on it, and keep it short. A card at the highchair, said out loud, is the shape of it.
• Two to five: under an hour a day, chosen rather than defaulted to, and with you. Turn it off before they turn away.
• Any age: no screens during meals or in the hour before bed, and none in the background — a television on in the room reduces how much parents and children talk to each other even when nobody is watching it.¹

The fuller picture of how babies actually learn words — and how little of it involves a device — is in the first-words guide.