Nature Tales from the Cryptkeeper : Season 1 Episode 2

When brothers Rick and Teddy attend a family picnic, they start tormenting ants in an antpile. That is, until, a anti-magnifying ray shrinks them the size of an ant. The brothers and the ants quickly find themselves befriending one another to deal with obstacles -- but the largest obstacle is Rick and Teddy's baby sister, who now appears to be a giant.