Kate Middleton is no stranger to following protocol and sticking to tradition after marrying into the Royal Family. However, the mum of three, 40, has a few traditions of her own that she’s put in place for her children Prince George, eight, Princess Charlotte, seven, and four year old Prince Louis.To celebrate the young royals’ birthdays, Kate previously told Mary Berry that she has started a tradition that involves baking them each a homemade cake for their birthday.