The nappies had a special quality whereby when they got wet, a heart pattern appeared. The baby ponies were fitted inside with a clear plastic tube that went from the mouth to just below the tail, so when water was fed into the mouth of the pony, it went through and out of the back. While this prevented water from getting into the whole pony, there have been cases of mould in the internal tube.

This set had their own unique poses due to the internal pipe mechanism, and there were no pegasus ponies in the set. In North America, Baby Rainflower and Baby Wellyboot were called Baby Cuddles and Baby Snookums (both recycled names.)