In Europe in the 19th century, the cakes baked to serve at the christening of an infant were similar to wedding cakes. Eventually, since the wedding cakes were generally made of fruitcake, which would store well, and because the first baby often arrived within a year or so of the wedding, it became traditional to save the top part of the wedding cake to eat in celebration of the couple's first child. More recently, some people freeze part of the cake and save it until the couple's first wedding anniversary.
Once the marzipan is draped over the cake, gently pull down the sides to cover any gaps. Smooth the flat of your hand down the sides, pressing the marzipan to the cake and amoothing out any creases or overlaps, Rub the flat of your hand or a cake smoother over the top firmly to flatten and smooth the surface. Smooth out the sides in the same way. Trim off any excess marzipan around the bottom of the cake with a sharp knife and peel it off the board. This can be kept in an airtight bag or container for use next time.