Sore Ike! Anpanman: Minna Atsumare! Anpanman World

それいけ!アンパンマン みんな集まれ!アンパンマンワールド

Synopsis

Baikinman turns Anpanman and friends into babies by using the red water from a mysterious fountain that turns anyone who touches it into a baby. Some sources list the movie having 3 episodes that total of 30min