Personalized Dinosaur 4th Birthday Toddler Full Zip Hooded Jacket. A dinosaur apatosaurus (or brontosaurus to the grandparents) stands tall over the 4 for the fourth birthday. Happy 4th birthday to the four year old! 7.5 oz., 60/40 cotton/polyester. Jersey-lined double-needle hemmed hood. Pouch pockets for all their treasures. Coverstitched shoulders and armholes. Coverstitched rib waistband and cuffs.