H4 visa for newborn baby

[sms8430]

Hello everyone,
My husband is on H1B visa with approved I 797 and need to get visa stamping. i m on H4 visa abd got recently visa stamp.
Our baby is 2 weeka old and we are planning to get h4 visa for our baby.
1) can we get visa stamping for our baby alone as we have already got our visa stamped ( my husband is in the process and will get the stamp in a week)
2) can we go for dropbox option in this case or do we need to schedule in person interview?

Any advice is really appreciated

Thanks