A Detachable Crib is a magical item designed for infant care. While its exact physical appearance is not described in the novels, its name implies it is a type of crib with components that can be magically separated or are otherwise remotely controllable.
The primary advertised function of a Detachable Crib is to allow a caregiver to comfort an infant without being physically present at the cribside. An advertisement for the product claims it will “soothe your crying baby from a distance!”. The precise magical mechanics are unknown. The “Detachable” aspect might refer to a feature allowing the crib to be moved or its soothing functions (such as rocking) to be activated remotely, possibly via a separated component or a specific spell.
Detachable Cribs were marketed as a “new magical device” in the 26 February 1995 edition of the Daily Prophet. This places their introduction or a significant marketing campaign during Harry Potter's fourth year at Hogwarts.
The Detachable Crib is a minor world-building element that illustrates the kinds of magical conveniences available in wizarding society. Its advertisement appeared in the Daily Prophet on the same page as a malicious article written by Rita Skeeter about Hermione Granger. The mention of this mundane consumer product provides a contrast to the high stakes of the Triwizard Tournament and the cruelty of Skeeter's journalism, offering a glimpse into the everyday life and commerce of the Wizarding World. It was advertised alongside Madam Marsh's All-Purpose Magical Mess Remover.