Good day, moms? I'm pregnant now with the second one, the first child …

Good day, moms? I'm pregnant now with the second one, the first child (a girl) will be 2 years old when the second is born. Can you tell me how you prepared your first child for another baby? As far as I know, you need to buy a doll and show it by example and tell that it will be Lyalya. How else can you do it? Tell me about your experience on how you prepared and how your firstborn received the news about the new family member ??