1) Lyanna in her bed of blood - a phrase with a specific but unclear meaning because it lacks context
2) bloody bed = birthing bed - most likely the same thing but the different wording of the phrase allows for some doubt
3) women bring forth children in beds of blood - the meaning of the phrase is clarified by providing context, and it also confirms the assumption that bed of blood and bloody bed refer to the same thing
How do we know it's a phrase with a specific meaning? Because it is never used in any other context, even though there are situations involving beds and blood
"beds and blood" would be perfect words for House Bronn
R + L = J v.167
in General (ASoIaF)
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"beds and blood" would be perfect words for House Bronn