Well, In my church, the last time a toddler escaped his parents, and ran all the way up on the alter. The Priest just snagged him, and put him up on his shoulder, which the little boy loved. Then He said, the little boy had a calling (to the priesthood) everyone laughed, and he sent him back to his parents.
Before our new Church had built the Baptismal Font, our Priest decided to use a blow up kiddie pool. He Baptized a whole family, and then encouraged us all to come up, and bless ourselves with the abundance of Holy Water! Well my 2 year old son, dressed in his suit, dashed up there, and fell in! Yep, As he lay on the side of the pool, all the water gushed out, and flooded the first 4 rows!
I never saw people move so fast! I sure wish I had that on film! Ha ha priceless
Ten years later, having not learned their lesson, they asked my son to be an alter server. I said Father! He’s the one that drown us all with Holy Water, and you gave him fire? ha ha. He did almost light his hair on fire! no kidding. Then as He approached the alter, he tripped going up the steps. Father just laughed, and said, “He reminds me, of me!”
Don’t worry about tomorrow. The Priest will tell you what to do, and where to stand. He’s used to it. Just ask an usher if there is a nice lady to hold the baby near you. If she cries you can always just go get her! We are just one big family! Relax - Enjoy!