Visitor visa for kids

USA B1/ B2 Visitor Visa
1

Hello all ,
My sister and her husband are having visiting visas (b1/b2)now they want apply for their toddler son did any body know the process .Is he eligible for Dropbox ?or any visa slots open for visitors now in India.TIA

2

Child below 14 is eligible for dropbox.

http://cdn.ustraveldocs.com/in/in-niv-visarenew.asp