The new standard size packets, which roll out next week, feature images of a cat, pig, panda, owl and monkey, with chocolate Buttons for eyes. Cadbury White Buttons will feature a penguin character, with white chocolate Button eyes. The size and price of the 33g bags will remain unchanged at 46p.
The move, which will be supported by a £1m marketing campaign, comes two months after the confectionery giant redesigned the packaging of its Cadbury Dairy Milk Giant Buttons, which will not be affected.
Kate Harding, trade communications manager for Cadbury, expected the new designs to appeal to kids and parents alike.
"The new pack designs will have much better standout on fixture with the engaging characters looking right back at you," she said.
The Buttons Fun on the Farm campaign will include a variety of family-based activities around the country including flagship events at London's Mudchute Park on 23 and 24 May and Gateshead on 30 and 31 May. Tickets are free and can be obtained online.
Buttons on the Farm will be supported by PR, radio and press and outdoor advertising. Cadbury claims its Buttons range is worth £10m a year and is the biggest kids' confectionery mini bag on the market.
Last month, Cadbury announced an overall hike in first-quarter sales of 10% for its UK business. Booming Creme Egg sales and the continued success of the Wispa brand were credited for the uplift.