Lisa Amir's response from the British Journal of Medicine about
breastfeeding being one word:

<When we use "breastfeeding" as a noun we use one word, and as an
adjective then two words.
I am sorry if this messes up your searches.>

Gee, how do they spell it when it's a *verb*?

Seems to me that the distinction the BMJ uses above would use two words
far more often than our preferred single one.....

Karen Zeretzke, MEd, IBCLC
Baton Rouge, Louisiana