What are some age-appropriate ways to explain the concept of a new baby to older siblings?

Ma
Hey there, lovely ladies! I have a toddler at home, and I'm not sure how to explain the idea of a new baby to him in a way that he can understand. Any tips or suggestions on age-appropriate language, visual aids, or activities that can help toddlers grasp the concept of a new baby? Let's share our wisdom and help each other out!