Think about the main carers in your child’s life. What language does each one speak? How often? For what purpose? Is each carer going to address the child in one language, or in more than one? Which language(s) will be used when the main carers are together?
Many articles you find around the internet will tell you that there are two or three successful techniques for achieving success when raising children through multiple languages or trying to keep up skills in a minority language.