Understanding multilingual language learners: simultaneous vs. sequential language learning and when to worry about a delay

Raising a child who is learning more than one language is a wonderful gift, but it can also come with questions and concerns. Many parents wonder if their multilingual child is developing language skills typically. In this post, we will explore the two main ways children learn multiple languages, what typical development looks like for multilingual language learners, and how to spot whether a true language delay exists.

Let’s dive in.

Two ways children learn multiple languages

Multilingual children generally fall into two categories based on how they acquire their languages:

1. Simultaneous language learners

Simultaneous language learners are exposed to two or more languages from birth (or within their first year of life). For example, a child may hear Spanish from one parent and English from another starting in infancy. These children develop two (or more) language systems at the same time.

What to expect:

• Mixing languages (code-switching) is normal and does not mean there is confusion
• Vocabulary size in each language might appear smaller than monolingual (one language) peers, but combined vocabulary is usually meeting expected milestones
• These children may take slightly longer to begin speaking, but typically catch up without needing intervention

2. Sequential language learners

Sequential language learners are introduced to a second language after they have begun to establish the first language. This usually happens after age 3. This is common when a child grows up speaking one language at home and begins learning a new language at school.

What to expect:

• There may be a silent period while the child observes and absorbs the new language
• Errors in grammar and word use are common and are part of normal development
• Children may use their first language as a foundation and gradually transfer skills to the second (or third) language

When multilingualism looks like a delay (but isn’t)

It is completely typical (and expected) for multilingual language learners to:

• Start speaking a bit later
• Mix languages within the same sentence
• Know more words in one language than another
• Seem quiet when exposed to a new language environment

These behaviors are part of the natural process when acquiring multiple languages. However, this sometimes causes concerns when compared to monolingual peers.

How to tell if your multilingual child might have a language delay

There are times when a multilingual child may be experiencing a true language delay. Here are some red flags to look out for:

• Limited vocabulary in both languages. If your child isn’t picking up new words in either language over time, this may indicate a delay
• Difficulty understanding or following directions in either language
• Short, incomplete sentences past age 4
• Lack of progress in language use after several months of consistent exposure
• Trouble interacting socially, especially with using language to connect with peers or adults

Supporting both languages strengthens communication and identity.

Final thoughts

Learning more than one language is a powerful asset for children and their future. While multilingual language learners may have a unique developmental path, most will catch up and thrive. If you are ever unsure whether your child’s language development is typical, it’s always okay to reach out for professional guidance.