The pets are a little different - they are more difficult to find, as they are tiny and made of a rubbery texture that means they sometimes get confused with stationery or with other toylines. They use moulds from another related Hasbro line, which also adds to this confusion. Spare versions of these pets were released as a free gift with My Little Pony Comic #222 - for this reason, my childhood collection includes Susie and Billie, but all three pets!
The babies were sold on the same card, with stickers on each card to denote which one had which name. The ponies were also named on the back, helping to sort out identification. These cards were translated into multiple languages - English, German, French, Dutch/French, Spanish - but were the same in all other respects. The ponies had one collective story between them, and each baby came only with their small pet friend.

Variations - Promotional Models?

Two unexplained variations exist from this set. When I say "two", I mean two examples, total, not two variations produced en masse. There survives one known example of Baby Susie in the Baby Blossom Pose and one (possibly two) known examples of Baby Billie in the Ember pose. Aside the pose, these babies are the same as their standard versions in every respect. You can find out more about these babies on Billie and Susie's respective pages.