Make the Cinnamon Filling

Cup of Yum
1. Place all of the filling ingredients in a medium bowl and use a fork to combine them completely. Set aside.

Make the Cake

1. In a small bowl, add the warm milk. Whisk in the sugar and yeast until combined. Let rest for 7 to 10 minutes, until foamy. (If it doesn't get foamy, your yeast is dead, you'll need to start over).
2. In the bowl of a stand mixer, add the melted butter, 1 egg, egg yolks, vanilla, and yeast mixture. Add the paddle attachment and mix until combined, about 30 seconds.
3. With the mixer on medium speed, gradually add the flour until completely combined. Remove the paddle attachment and replace it with the dough attachment. Knead the dough on medium speed for 7 minutes. The dough should pull away from the sides of the bowl and become elastic and not overly sticky.
4. Remove the dough from the bowl and dough attachment and use your hands to form it into a smooth ball. Spray a large bowl liberally with cooking spray (or vegetable oil). Turn the dough over in the oil and place in the bowl. Cover with plastic wrap and place in a non-drafty, warm area until the dough has doubled in size, anywhere from 1 to 2 hours.
5. Preheat oven to 375°F.
6. Remove the risen dough from the bowl and place on a lightly floured surface. Use a knife or a bench scraper to divide the dough into two equal parts. Roll each dough into a rectangle that is approximately 24 inches in length by about 5 to 6 inches wide.
7. Spread the cinnamon filling on each dough, leaving about 1 inch of no-filling around the edges. Roll each dough tightly, lengthwise, sealing the seams with your fingers. Braid the two rolls and then form them into a circle and seal at the ends (see video for reference).
8. Place the unbaked cake on a large baking sheet that is lined with parchment paper.
9. In a small bowl, whisk 1 egg with 1 tablespoon of water. Brush the egg wash over the top of the dough. Place in the oven and bake for 25 to 30 minutes, covering with foil after about 15 minutes (to prevent the top from getting too brown).
10. Remove the cake from the oven and allow to cool completely before icing.

Make the Icing and Finish the Cake

1. To prepare the icing, place the sugar, melted butter, vanilla extract, and milk in a medium bowl. Use an electric hand mixer (or a wooden spoon) and mix until smooth and spreadable. The icing should be thick and not too thin. It should hold to an inverted spoon. If too thick, add a little more milk until the correct consistency.
2. Once the cake is cool, press the baby into one of the folds from the braided cake. Next, use a spatula to smear the icing all over the top of the cake. Liberally sprinkle on the glitter sugar, alternating purple, green, and gold. Serve at once or gently cover with plastic wrap until ready to serve.