Why Your Child Understood Everything But Stopped Speaking the Language After School Started

Passive bilingualism, the school shift, and what you can actually do about it

You spent years speaking your language at home in an effort to raise a bilingual child. Your child nodded along, said their first words in babbles that resembled your language, laughed at the right moments, followed every instruction (more or less). They understood everything. Then they started school… and something shifted.

Now they only answer in English (or French, or German, or whatever the community language is).

Now they look at you blankly when you ask them to respond in your language.

Now you wonder: did I do something wrong?

You didn’t. What you’re experiencing has a name, a well-documented explanation, and most importantly, a path forward.

What Is a Passive Bilingual?

Before we talk about the school shift, it helps to understand the term passive bilingual — because it’s often misunderstood.

A passive bilingual is a child (or adult) who has significant receptive competence in a language. Meaning they can understand it well but rarely or never produces it spontaneously. They hear the language, process it, and comprehend it. They just don’t speak it back. (If you’re wondering whether this sounds like your child, this post on why bilingual children only speak one language breaks it down in more detail.)

This is different from not knowing the language. Passive bilinguals have an underlying linguistic system.

The language is there. It’s just not being activated for output.

Understanding Heritage Language Speakers

Linguist Jason Rothman’s work on heritage language speakers gives us one of the most useful frameworks for understanding why this happens especially for children growing up in minority language homes.

Rothman defines heritage speakers as individuals who were exposed to a non-dominant language (the heritage or home language) from birth, but who grew up in an environment where a different, socially dominant language became primary. Think: a Spanish-speaking family in the United States, a Portuguese-speaking family in Germany, or a Cantonese-speaking family in Canada.

One of the key features of Rothman’s framework is what we might call the school shift — a predictable change in a child’s language dominance that occurs around the time they enter formal schooling, typically between ages 4 and 6.

This shift is in considered by linguists to be a key, defining feature of heritage languages.

The School Shift: What It Is and Why It Happens

Before school, most children in minority-language homes spend the majority of their waking hours in the home environment with one or both parents. The home language is the primary means of communication. It’s the language of comfort, routine, play, and connection.

Then school starts and everything changes. (For a deeper look at how to navigate this transition proactively, see: How to Maintain the Home Language When Your Child Starts School in English.)

Suddenly, children spend 6–8 hours a day immersed in the dominant community language. That’s where they make friends, learn to read and write, navigate social hierarchies, and build identity. The community language doesn’t just become useful or nice to have it becomes socially essential.

At the same time, the home language loses ground. Not because children forget it, but because the balance tips. Several interconnected things happen simultaneously.

1. The source of language input shifts… away from parents.

In the early years, parents and caregivers are the primary source of language exposure. Research confirms this clearly: during infancy and toddlerhood, primary caregivers are the main source of language experience, but when children enter school, peers and the academic environment increasingly shape children’s language abilities in the community language (Fibla et al., 2022). This is a seismic shift. The adults who spoke the home language with your child are no longer the dominant influence on their daily language experience, their monolingual or community-language-dominant peers are. And those peers speak the language that becomes socially needed.

2. Peer belonging becomes a developmental priority.

This is not simply a matter of social preference — it reflects a genuine developmental shift. Research on middle childhood consistently shows that between the ages of 6 and 12, socialization in the peer context becomes a central organizing force in children’s lives in a way it simply wasn’t before (Hartup, 1984).

Children at this age are highly attuned to similarity and research shows they actively seek out peers who are like them, and being seen as different carries real social risk. Studies across Korean, Japanese, and Eastern European immigrant families have documented the same pattern: after children begin formal schooling, they increase use of the community language even at home, and resist speaking the heritage language — not out of defiance, but out of a powerful drive to belong within their social groups (Kang, 2012; Brown, 2011; Nesteruk, 2010). Language identity and shift occurred specifically when children started attending school (Tse, 2001; McCabe et al., 2013).

3. Peers become the most powerful language model.

Research on dual language learners in Germany found that the language skills of a child’s classmates, not just their teachers, had a measurable effect on their majority language growth (Schmerse, 2021). In other words, who your child sits next to, plays with, and talks to at school is actively shaping their language development. When all of those peers speak the community language, the pull toward that language is intense and constant.

4. Output need disappears.

At home, many parents understand the community language too (even if they try to pretend they don’t) so children quickly learn that switching languages “works.” There is no communicative pressure to use the home language. As documented across many heritage language studies, children follow the path of least resistance: if they can be understood in the dominant language, they will use it.

5. Cognitive and literacy resources consolidate around the dominant language.

School introduces something the home environment rarely provides: formal literacy in the community language. Learning to read and write in one language accelerates that language’s internal processing speed and efficiency. Research shows that the school period is critical precisely because some language structures are only fully consolidated through literacy exposure (Frontiers in Language Sciences, 2025). Heritage language children, who receive little or no formal literacy support in the home language, can find that producing it starts to feel effortful even as their comprehension of their parent’s dialects remains strong.

The result? A child who once moved between both languages freely now defaults to one. Their heritage language shifts from active to passive and accelerates as they gain higher level language in the community language (the language they speak “better” or “sound smarter in”).

The School Shift Is Happening Earlier Than Ever

Here’s one thing that I think is important to note and that even some older research doesn’t fully reflect: the “school shift” no longer waits for school.

Across OECD countries, full-time enrolment in early childhood education has risen dramatically over the past two decades. Globally, pre-primary enrolment rates increased from 30% to 44% between 1999 and 2014 (UNESCO, 2020), and in many high-income countries the rates are far higher — reaching 98% or more for four-year-olds in countries like France, Spain, and the UK. In the United States, the number of two-year-olds in centre-based care nearly doubled between 1995 and 2005 (ASPE, 2012). In short: children are entering majority-language environments younger and younger — often as toddlers, not as school-aged children.

This matters enormously for heritage language families. Research confirms that the shift in primary language input source, from parents to peers and the wider educational environment, begins not at age five or six, but at whatever age a child enters non-parental care (Fibla et al., 2022). One study found that children under two years old had already begun resisting heritage language management strategies from parents after being introduced to the societal language at daycare (Slavkov, 2015, as cited in Rose et al., 2024). The mechanics of the school shift, in other words, can begin in the toddler years for many of today’s families.

Why does older research miss this?

This is an important point worth addressing directly. Much of the research that still circulates (for good reason!) in parenting books, on bilingualism websites, and in some professional guidance was conducted using data collected in the 1990s and early 2000s, when full-time daycare and preschool attendance was far less common, and when it typically began later. Academic research has a long pipeline: data collection, analysis, peer review, and publication can easily take five to ten years. This means that studies published in the 2010s often reflect the childhoods of children born in the early 2000s or 1990s — a cohort whose early language environment looked quite different from the children born today.

The practical implication for families is significant: if your child started full-time nursery or daycare at 12, 18, or 24 months, the language dynamics you are navigating are more complex, and with an earlier-onset than many traditional frameworks account for. The window for supporting active heritage language use is not from age four to six. It may begin much sooner than that.

Is This Normal? (Yes. And Also: It Matters.)

The school shift is normal. It is well documented, expected, and happens to the vast majority of children growing up in minority-language environments. If your child is going through it, you are not failing — you are experiencing one of the most predictable patterns we expect in bilingual development.

However, normal doesn’t mean inevitable or irreversible. It also doesn’t mean it should be ignored.

Research consistently shows that when passive bilingualism goes unaddressed during childhood, the window for reactivating the heritage language narrows over time. Adolescents can and do reactivate languages, but it typically requires more effort and intentional intervention than it does in middle childhood. It also requires full buy-in and high motivation from the child, your influence as a parent wanting to reconnect with the language/heritage plays a singificantly smaller role.

The earlier families understand what’s happening and respond with targeted support, the better the outcomes.

What Passive Bilingualism Is NOT

It’s worth taking a moment here to clear up some common misconceptions:

• It is not stubbornness, defiance or rejection: children switching to the dominant language are following the path of least resistance, not rejecting your culture.
• It is not proof that bilingualism “didn’t work”: passive competence is a genuine form of bilingual ability, and it can be built upon now or at a later date.
• It is not permanent: with the right conditions and strategies, passive bilinguals can and do become active speakers but this rarely happens on its own.

Why Understanding the “Why” Is the First Step

Many parents respond to the school shift with strategies that feel logical but often backfire: pretending not to understand their child, refusing to answer unless spoken to in the home language, or using reward charts and pressure.

The problem with these approaches is that they don’t address why the child isn’t speaking. And the reason matters a lot.

Is it a lack of exposure? A speaking anxiety? A sense that the language isn’t “theirs”? An imbalance in language skills that makes production feel frustrating?

The strategy that works for one root cause can make another worse.

This is exactly why the school shift requires more than tips. It requires a framework.

What You Can Do

If your child is a passive bilingual (or is starting to show signs of heading in that direction after beginning school or daycare) there are concrete, evidence-based strategies that can help. The goal is not to force speech, but to create conditions where speaking the home language feels natural, low-pressure, and worth it for your child.

This includes rethinking your home language environment, identifying your child’s specific “activation points,” adjusting how you respond to language switching, and building motivation and confidence from the inside out.

If you’re ready to move from understanding why this happens to knowing exactly what to do about it, the Language Reactivation Masterclass was built for exactly this moment.

It’s a research-backed course designed to take your child from passive understanding to active speaking without unnecessary pressure, conflict, or pretending you don’t understand them. You’ll walk away with a clear, personalized activation plan you can start using the same day.

Explore the Language Reactivation Masterclass →