Teratomas are not normal fetuses; they are a type of tumor originating from germ cells in the ovaries. Pregnancy will not affect the normal development of the baby, and regular prenatal check-ups at the hospital are advisable. If it is possible to surgically remove the teratoma before trying to conceive, it is best to do so. Teratomas can be benign or malignant. Benign teratomas contain various components, including skin, hair, teeth, and bones. Malignant teratomas are poorly differentiated and more prone to malignant transformations and metastasis.