If you find it continues I can highly recommend the "What" method. You don't ignore them when they speak but you do say "what" and basically make things really slow to prompt them to use your language. Copying from a friend
"The “What, what, what” rule I’ll try to describe it:
Say your child says something in German when he is supposed to say it in English to you. For instance, he is pointing at your watch and keeps calling it Uhr.
Then there are two options: he doesn’t know/recall the word watch or is refusing to use English.
In any case, you should never lie. Your child knows full well that you understand both languages. However, you should make it inconvenient to use the “wrong” language. You have to create a NEED to use the correct language, it’s pretty much “use it (the language) or lose it”.
So what do you do? The child says Uhr. You pretend to be a little bit hard of hearing or understanding. You say: “What?”
If the child says “Uhr” again, you again say “What?”
If the child says “Uhr” for the third time, chances are he or she doesn’t recall or know the word watch. So you offer it by saying:
“What? Oh - you mean my watch!”
So you use “what?” three times. Then you offer the word.
It makes conversations slow at first and may drive everyone (you included!) nuts.
It can take up to three weeks. With my (then 1.5 year old) daughter, however, it only took three days. After that she has never used German with me again - ever 🤣
The idea is that if it’s inconvenient to use the wrong language, they’ll stop it. And you’ll be astounded how many more words they actually already know in the minority language than you may have thought."
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