Talking to Your Baby Might Matter as Much as Reading to Them — Here's What the Research Found

Somewhere you picked up the idea that you should be talking and reading to your baby constantly, narrating everything, building their vocabulary word by word — and some days, with a toddler attached to your leg and dinner still to cook, that feels like one more thing you're not doing enough of. It's worth knowing what the research actually says you need, because it's smaller than the pressure suggests.

The core finding: it's the back-and-forth, not the word count

Rachel Romeo, then a graduate student at Harvard and MIT, with senior author John Gabrieli of MIT, published a study in Psychological Science in 2018 using recordings of children's home language environments. The number of back-and-forth "conversational turns" — you say something, the child responds in some way, even a babble or a gesture, and you respond back — was more strongly linked to children's language scores, and to activity in Broca's area, a key language-processing region of the brain, than the sheer number of words the child heard. Brain activity in that region fully accounted for income-related differences in language skills in their sample: children from lower-income homes with many conversational turns showed language outcomes similar to higher-income peers with fewer turns.

That matters because a lot of the advice parents absorb focuses on quantity — talk more, narrate more, read more pages. This study points somewhere else: what seems to count most is whether your child gets an actual turn in the exchange, not how many words landed on them.

The bigger picture: this isn't really new, it's a correction

Much of today's "talk more to your baby" advice traces back to Betty Hart and Todd Risley's 1995 book Meaningful Differences in the Everyday Experience of Young American Children, which popularised the idea of a "30-million-word gap" between children from different income backgrounds by age three. That framing pushed a generation of advice toward counting words. Romeo's work, and the MIT lab's related research, suggests the original word-count framing missed the more useful variable: it's not about pouring words onto a child, it's about getting a response and responding back.

A quiet toddler who babbles back when you ask "what's that?" and point at a dog is doing the thing that matters, whether or not you're holding a book at the time.

Where it's genuinely uncertain

Researchers in linguistics and linguistic anthropology, including a 2015 forum in the Journal of Linguistic Anthropology led by scholars like Jonathan Rosa, have separately pushed back on "word gap" framing in general, arguing it risks treating lower-income or multilingual homes as deficient rather than simply different in communication style. Romeo's own study was conducted with a relatively small group of 4-to-6-year-olds in the United States, not in Indian households, and conversational style, joint-family dynamics, and multiple languages at home could all change how "a conversational turn" even looks. Treat this as a genuinely useful finding, not a settled, universal rule.

What this means this week

• Tonight, try turning one everyday moment into back-and-forth instead of narration. Instead of just saying "we're putting on your shoes now," ask "which one goes first?" and wait — even a pointed finger or a babble counts as their turn.
• Don't feel that only book time counts. Bath time, the drive to school, folding laundry together — any moment where you ask something and wait for a response builds the same skill books do.
• Use picture books as a prompt for turns, not a monologue. Point at the picture and ask "what's that doing?" instead of only reading the text straight through.
• Talk in whichever language feels most natural to you in the moment. The research is about the exchange happening at all, not about which language it happens in.

Sources

Romeo, R. R., Leonard, J. A., Robinson, S. T., West, M. R., Mackey, A. P., Rowe, M. L., & Gabrieli, J. D. E. (2018). Beyond the 30-Million-Word Gap: Children's Conversational Exposure Is Associated with Language-Related Brain Function. Psychological Science, 29(5), 700–710.

Hart, B., & Risley, T. R. (1995). Meaningful Differences in the Everyday Experience of Young American Children. Paul H. Brookes Publishing.

Rosa, J., & Flores, N. (2015). Hearing Language Gaps and Reproducing Social Inequality. Journal of Linguistic Anthropology, 25(1), 77–79.

Related reading

• When Should I Start Reading to My Baby? What the Research Actually Shows
• Does Being a Late Talker Mean My Child Will Struggle With Reading Later?
• Grandparents as Reading Partners: Why Story Time With Nani-Nana and Dadi-Dada Counts

Find books that fit your toddler — take the 2-minute reading assessment