I am eligible for dropbox visa re stamping as my previous H4 visa expired within 12 months.

The website states that :
For Children below 14 years of age : Child needs to submit
Children under 14 must submit a photocopy of both parent?s passport biographic information and valid U.S. visa page.

My husband has a Valid H1b visa stamped in his passport however I am going through re stamping of my H4 along with my son.

The question I have is -
Is my son(6 years) be eligible for H4 Visa re stamping dropbox along with me

Or Do I need to take an appointment for him