You need not worry. Accidental double dose of Hepatitis A vaccine is not going to harm your child in any way. Overdose of vaccine made from live virus can be harmful in immuno compromised individuals like a person already suffering from HIV.
But next time onwards be more cautious & do get your child protected from Hepatitis B and other infections by following proper vaccination schedule .
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.