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отмечать дни рождения stresses
Makarov.	observe birthdays
отмечать день рождения
gen.	keep one's birthday (festivals, etc., и т.д.); have a birthday party (TransAccess)
product.	celebrate birthday (Yeldar Azanbayev); commemorate day of birth (Yeldar Azanbayev); mark birth date (Yeldar Azanbayev)

отмечать дни рождения: 7 phrases in 3 subjects

American usage, not spelling	1
General	4
Makarov	2