Hey! Girls, maybe someone has a similar situation... It's too early to…

Hey! Girls, maybe someone has a similar situation... It's too early to think about it, but... We live in Poland, we talk at home in Russian. Although there are two additional national languages - I have my own, my dad has his ? but these languages will be later for sure. How do you teach a child their first words? What language should you speak and so on. In a year, the child will go to kindergarten, there will definitely be Polish only.