My Little Pony Age 4 Birthday Card First introduced into the toy market in 1983, My Little Pony is an entertainment franchise developed by Hasbro. These ponies are special as not only are they colourful, they also each possess a unique symbol. The card says "4 Today. Happy 4th Birthday. Hope It's The Best Birthday Ever!" There is an opportunity for your little one to show off their colour skills and for you to write your own personal message.