Rubber Duck

 is a baby item that can be given as a gift.

Obtaining
can be purchased at the Round Table Badge Exchange for Knight Badges or Gols. The are listed separately by price, so up to two of this item can be bought per day.

Gift
can be given as a gift to other characters. A child may also ask for one specifically as an interaction, and it provides a significant relationship boost when given. The request is a separate interaction from gifting, and thus, it is possible to both fulfill the request and gift a different item on the same day, for a total of two items given.