Is it possible for you to have babies if you have a pituitary tumor?

Depends on type. Pituitary tumors can be small (micro adenoma) or large (macro adenoma). They can produce dysfunction of the pituitary gland from direct compression, or by secreting different types of hormones. These hormones can potentially interfere with normal hormone release that would adversely affect fertility. It is possible to get pregnant if you have a tumor, if normal pituitary function is restored.