This completely depends on the sprinkles! Very tiny round or straight ones are probably fine, as long as they’re used very minimally and mixed well into either the cake batter or the frosting, allowing them to soften. Be careful not to use too much or have too many in one bite to lower the choking risk for your baby.  However, you will want to completely avoid the use of draguees or sugar pearls, as these are much harder, are round and larger – all of which would make them a top choking hazard. There is of course the matter of them being a source of added sugar and food coloring as well. If you’re trying to avoid those, then we’d recommend sprinkling some broken freeze-dried fruit pieces on top or even some of the powder once they’ve been blended to color the icing. You can also just quarter some of their favorite fruit to put on top, like raspberries or blackberries or blueberries.