Until the interview was actually scheduled by NVC, you could have slowed it down. Best case scenario, now, is that the consulate processes the child's case at your interview (although, they aren't supposed to). Good luck.
Your spouse should have waited to naturalize. Now, there are limited options.
IMMEDIATELY contact the consulate!!!!!! Explain the situation!!!!! I suspect they will instruct you do one of the following:
Option 1:
1. Contact the consulate and tell them to postpone your interview, and explain the situation. Tell them to schedule both interviews together when the child's case gets there.
2. IMMEDIATELY, contact USCIS and request an expedite of the child's case.
3. When the child's case gets to NVC, IMMEDIATELY request to expedite to the Consulate.
Option 2:
They aren't supposed to do the following, but the Consulate MIGHT allow you to bring the child to your original interview. Then they might process the child's case then (I-130 & DS-260). They must give you permission first.
Good Luck.
Good news everyone IL's going out. I see up to January 7, 2021 so far. Check your emails if you are January 2021 DQ please let us know and complete the form in my signature so I can update spreadsheet.