Log into Breeze
click on People
click on Show More Filter Options
click on Birthday, then Date
leave Day and Year set to Any, and select the month you want
The people with the birth month you selected will be listed on the right
On the right of the screen, click on Export
for Format, select Excel, then click on the pencil in the left corner of the small window
for Include, select Custom
this pulls up a list of all fields, select Name and Birthday
click Download to save the file