Why do pregnant women always hold their belly in photos?

So I'm pregnant, and I understand holding/rubbing your belly when the baby is kicking, or just to connect with or comfort the baby. However, why do so many women feel the need to hold their belly in a posed position when taking selfie photos or in any photo? Is it supposed to be more flattering or something? Just don't understand the posed hand, and it's strange to me. 🤷🏻‍♀️