Segments - Can I do this??

Two scenarios based around segments, are they possible? Can I do them in a single campaign?

A. Birthday
I have a custom field for my subscribers called birthmonth. When I send out my monthly email, I want to include at the top of the content an image and a line "Happy birthday <name>!" for those whose birthday will be in this month.

B. Premium
I have a custom field to denote premium subscribers to my website. Each month when I send out my newsletter I'd like to include a special offer only on the newsletters for the premium members. I'd like this to be replaced with an advert on why you should become a premium member for those who are not.

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