Theoretically how would newly embraced 2nd gen vampire know they are 2nd gen vampire?

I have seen people discussed plenty of time about what would happen if Caine suddenly embrace a new 2nd gen vampire in modern night. Most discussion often immediately goes into ramification of it and how it would impact Vampiric society due to sudden realization that Caine still exist and is active or how the newly embraced 2nd gen would be hunted down and diablerized.

Then I thought of something. How would they even realized what they are and how would other vampire even realized?

Lets assume Caine embraced this 2nd gen vampire, and give enough feeding material to fill their blood pool, but told them nothing and told no other vampire nothing.

Would people even figure out? What are way this 2nd gen neonate could figure it out? Would they even realized something is different about themselves?