i need urgent help so that i can stop scratching my head.

I have received my naturalisation letter a few days ago and have my ceremony booked for 24th January... However i was filling in a passport application form for my child who was born (after i had ILR) and is a british citizen by birth, which requires me (as a father) to send my Original Biometric card with his application..
- 1

- 2

Ideally i wouldnt want my ceremony to be delayed as the next one is available in March, and want to make sure that i take a correct approach.
when i looked at urgent passport appointment, it says that "In rate situations Child can't use this service where (a) parents were born outside UK or (B) child is not registered as british citizen... so what i understand is i cannot go for urgent passport..
Can someone help with this situation please ?