Yes. Generally fever certainly is not fun, but does not fall under the criteia of a dangerous reaction. And it is still "better" than a serious, potentially life threatening case of the hepatiti b. Immunize!
No. Though it's not very common, infants can get fevers after their vaccination. Vaccinations work by stimulating the immune system and it's the immune response that can occasionally cause a fever. There are very few reasons, other than significant allergic reactions, to delay the next dose in a series. This is from the cdc: http://www.Cdc.Gov/vaccines/recs/vac-admin/contraindications-vacc.Htm.