The short answer is that both pathways are viable—but the neurobiology of learning offers clear clues about which approach works best depending on context and the learner's profile.
Before choosing, it's crucial to distinguish two concepts that are often conflated in educational debates:
The child speaks and understands two languages. This emerges naturally through mere exposure in early childhood.
The child must decipher an arbitrary written code. This process is not natural; reading is a recent cultural invention that requires explicit, systematic instruction to "rewire" the brain (Dehaene, 2009).
Let's examine what the evidence says about the two main pedagogical approaches—and how to choose the right one for your context.
This approach prioritizes establishing decoding skills and reading strategies in a single language (typically the home language or the one most dominant in the environment) before introducing formal reading instruction in the second language.
- Transfer of metalinguistic skills: Learning to read is a milestone the brain consolidates "for real" only once. Phonological awareness, the alphabetic principle, and comprehension-monitoring strategies anchor in Language A and transfer automatically to Language B. The student doesn't have to learn to read again—they simply need to map new grapheme-phoneme correspondences (August & Shanahan, 2006).
- Lower initial cognitive load: By focusing attention on a single orthographic system, working memory saturation is reduced during the most demanding phase of reading automatization.
- Families or schools aiming to strengthen the heritage language before the majority language displaces it.
- Children with uneven oral exposure or early signs of difficulty developing phonological awareness.
- Contexts where orthographic transparency differs dramatically (e.g., Spanish to English), and building quick reading confidence through the more accessible code is a priority.
This approach introduces decoding and writing in both languages concurrently. It is the default model in many Dual Language Immersion (DLI) programs and bilingual schools.
- Neurocognitive compartmentalization: The young bilingual brain possesses exceptional plasticity. It is fully capable of maintaining separate orthographic systems—as long as instruction is explicit, contrastive, and systematic (Genesee et al., 2005).
- Balance in academic register: Prevents one language from falling "behind" in its written modality. From the outset, the child associates oral vocabulary in both languages with their formal written representations.
For simultaneity not to cause confusion, teachers must actively teach phonetic and orthographic contrasts.
Example: The letter j in jirafa (/x/) versus j in juice (/dʒ/). Without contrastive instruction, the brain tends to apply rules from the more transparent language to the more opaque one, potentially cementing errors.
If you're at this pedagogical crossroads, analyze these three essential variables:
Spanish is a highly transparent language (>95% regular grapheme-phoneme correspondences), whereas English is opaque (~49%). Starting in a transparent language often yields faster reading gratification, building self-efficacy that greatly facilitates later tackling the opacity of the second language (Seymour et al., 2003).
Never teach decoding in a language the child does not orally comprehend. According to the Simple View of Reading (R = D × C), if oral comprehension is negligible, decoding becomes a mechanical exercise. A minimum threshold of receptive oral vocabulary in the language of instruction is recommended before initiating formal reading.
If the school is already providing literacy instruction in the majority language, home efforts should focus on maintaining orthographic connection and fostering a love of reading in the heritage language. In this scenario, equitable exposure and shared reading matter more than the strict order of introduction.
Did you teach reading in one language first, or both simultaneously? Did you notice differences in your child's or student's confidence or reading fluency? I'd love to hear from you in the comments!
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