Siblings rival

To these who have more than one kid. How did you stop or helped overcoming jealousy issues in the older sibling/s? Or there was no jealousy at all? What’s the age gap between your kids? How do u cope? How is it to bee a mother of 2-3 and so on? For me, one is already super hard haha. What are the pros:cons of having more than one child in your opinion. Please do share 🌷