TTC #2 and terrified!

Anyone else have a literal perfect first born and terrified of having another baby?

My husband and I want to start trying for our second baby this summer. Our daughter is 16 months old and has been basically a perfect baby.

She was sleeping through the night from 2 months old, never had colic, no health issues, no allergies, switched to formula like a champ, took to solids like a champ, not picky, puts herself down for naps, sleeps 12 hours at night and isn’t super fussy.

I want to give her a sibling so bad, but I’m terrified that the next one will be a monster! Lol

My mom, my sister and my grandma both had a perfect first born and then a horrible second child.

I watch my sister currently struggling with her second born who is a year old and wakes up every hour, has so many allergies, cries all the time and won’t leave her side without freaking out.

How do I get over this fear of having a difficult baby?