Right after birth, vitamin k will be given to the newborn. As early as this time, Hep B vaccine can be given to the baby. The second shot will be on the second month. Immunization schedule can start right after birth, then 2 months, 4 months, 6 months, 12 months and so on. Usually, the hep B vaccine can be given during adulthood so typically, other babies get vaccinated when they reach 2 months.
It is best to consult your pediatrician about this matter.