Baby's First Christmas. Capture every special moment of your baby's 1st Christmas with Baby's First Santa Hat Your little one will look precious in this hat for every holiday picture. One size fits most babies. Approximately 16 1/2 circumference around inside of hat. Approximately 10 tall. Traditional red and white Santa hat adorned with a pom pom. Make this holiday season the best yet, with darling Christmas Santa hats. Be prepared with costume accessories, decorations, and supplies you will need for your Christmas season.