6month old baby in the zoo

Hi ladies... sooo I wanna ask if is it safe to bring a 6 month old to the zoo? I’m gonna be working tomorrow and I’ll be leaving my 6 month old with my boyfriend’s mom, his grandmother. My boyfriend have a little sister 5y/o who wanted to visit the zoo tomorrow. I’m panicking because I don’t want them to go anywhere really with my baby. Don’t be thinking too that “you’re the one who’s asking a favor, you should let them” nope. Ever since I dated my boyfriend, 4 years ago, I’ve always looked for and baby ist his sister because other siblings wouldn’t do it. I do everything for her mostly.and up till now, I do when they leave for work. So I have the baby and the little sister every night to look after and feed.

I’m just not comfortable leaving my baby because of my anxiety, let alone being out with someone else. I worry that they won’t pay attention as much as I do and something might happen like him getting sick or sitting on poop for minutes and minutes. It happened already that’s why I think it.

I wanna call off so they can run along and do what they want as long as they don’t drag my baby. What should I do??? Heeeelp!!!