My DD is nearly 3 years old and she has heard my native language (Finnish) since she was a baby but at some point I started talking to her in English. I think I found it easier as my DH only speaks English. My DD can understand quite a lot in Finnish and she knows random words but that's about it. She can't put the words together in a sentence and her understanding is limited. I'd like her to learn more and I've started to speak to her in Finnish now but have I left it too late? She can't understand half the things I say to her and it's a struggle.
Has anyone successfully introduced a second language later on?