If you're photographing your baby at home, clear the background of anything distracting. Be aware of clutter on the counter and try to keep the focus on the baby. Often frosting (especially colored frosting) will leave some residue, so be sure to consider the possibility of a baby being nearby and make sure anything the baby can touch is easy to clean.
If you're in a studio, you'll probably have some say in your mexico number lookup Smash Session background theme. Whether you stick with something simple like a balloon arch, or go for a more detailed theme, I recommend keeping things a little simple so the focus is on the baby. Find tasteful ways to bring up your theme without overwhelming your child. I like to keep a blank space where the baby is and have a few main theme elements in the background. Usually these include a prop or two, some balloons or banners, and a prop of some kind.
Props
Other props that can enhance the scene include something for baby to sit on (I mainly do this during the milestone portion of the class). Perhaps a favorite lovey or other item that baby likes to hold (these are super sweet, especially if they have sentimental value to the family). If baby is in a newborn class with me, I like to incorporate an element of the newborn class into the cake smash. Perhaps a lovey that they hold, or a bed that they lie in to show how much they have grown.