Girls, can you tell me if I should introduce the mixture gradually too…

Girls, can you tell me if I should introduce the mixture gradually too, if I'm giving it before bedtime? Should I start with 30ml and then increase to 60ml until reaching the norm? If we only give one feeding of the mixture per day, how much do we usually offer at this age? What kind of mixture do you use for your babies? I hope to try this and reduce the number of nighttime feedings after mixing.