What is simultaneous bilingualism?
Simultaneous bilingualism is when a child learns two languages at the same time from birth or very early childhood, usually before about age three, so both develop as first languages.
Children who grow up with two languages from the start are often called simultaneous bilinguals. This usually happens when parents speak different languages, when the family language differs from the community language, or when a caregiver uses another language every day.
For example, a baby in Spain with a Spanish-speaking father and an English-speaking mother might hear both languages from day one. As a toddler, they may say "agua" to Dad and "water" to Mum, and sometimes mix words from both.
Simultaneous bilingual children generally reach language milestones within the typical range. Their vocabulary may be spread across two languages, so they might know some words only in one language. When you count words in both languages together, their overall vocabulary often looks similar to that of monolingual peers. One language may also be stronger at different stages, depending on how much they hear it.
Practical tips: give each language regular, meaningful time through conversations, play and routines. Strategies like OPOL or MLAH can help create balance. Do not worry about occasional mixing; it is normal. Keep an eye on the weaker language and add extra input such as books, songs, stories and time with speakers of that language. Hearing familiar stories in both languages can help children link words across the two.
If you are worried about your child's speech or understanding in both languages, a speech-language therapist can offer guidance.
