Night out

Hey mommas, the 14th is my wedding anniversary and my husband wants to take me out. We've been on dates since kids, but never when they were under a year old. I have a 8yo special needs son, a 6yo girl and a 3mo baby girl. Im having a hard time deciding if I want to leave my baby with my hubby's parents or take her with us. Its our first anniversary and our first time being out since we got married. Baby girl is exclusively breastfed but has had a bottle in the past and I have breast milk frozen. Also hubby's parents have 5 children ranging from 1 to 8 of their own to care for. What should I do?