Why do my ribs hurt when I lay on my stomach?

For some background, I’m a small woman (size 0-1ish) and I’ve always been small. My ribs always hurt when I lay on my stomach and always have since I was a kid. It’s like a pain on both sides of my rib cage and it’s like a stiff pain that aches for a while after. If anyone has any insight, it would be appreciated and if there are stretches I could do to help it I would be grateful to know. Thank you!

Update:

Can someone please answer this???

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