I've heard so many different things regarding that. I was told that the best thing is that is you start a sentence in a langiage keep it to that language and don't mix up words. I do use certain flemish words with Ollie and read books to him as my pronunciation is good, I just need to build on my vocab.
Ollie does speak a few words and seems understand a little too. The teachers are quite impressed with him already.
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