Fun Kid’s Costumes from Fierce Costumes - Choose from our huge selection of all types of kid’s costumes, from the classic costumes to the most popular styles for Halloween today. Some of our most popular kid’s costumes are our girls Wonder Woman costume, boys Woody from Toy Story, child’s vampire costume and our Kid’s Harry Potter. Our child costumes come in many sizes from X-Small to X-Large. When it comes to finding the perfect child costume for your girl or boy, we are confident that you will find that special costume to make your growing little guy or gal’s Halloween or holiday event and unforgettable experience. Even big girl’s and boy still love to pretend, so we invite you to create a play date, order a costume and inspire your child to have fun dressing up!