 [ Symptoms ] i am tired legs feel heavy and have disequilibrium doctors can not pinpoint problem [ Disease ] for the hepatitis a vaccine two doses of the vaccine given as shots six months apart are recommended for complete protection children should receive the first dose between 12 and 23 months of age children older than 2 can receive the first dose at their next doctor is visit for the hepatitis b vaccine children should receive their first dose at birth and complete the series based on their doctor typically the second dose would be given when the infant is 1 month old and the third dose when the child is 6 months old