Hepatitis B is basically a crackhead STD, spread by blood or semen. Why does a 6 year old need it?
Your kid should not be getting Hep-B.
HepB also has documented transmission in early childhood from spitswapping infants and toddlers and is almost always asymptomatic until their liver fails in their 50’s.
With the wholesale importation of 3rd world illegals our country is not as clean and safe as it once was.