What do you call a one-piece sleeping suit for an infant or toddler that covers the feet?

The term "sleeper" is used to describe a one-piece sleeping suit designed for infants and toddlers that typically includes coverage for the feet. Sleepers are known for their practicality and comfort; they often feature a front zipper or snap closure for easy dressing and diaper changes. The footed design helps keep the child warm and prevents them from kicking off blankets during sleep.

While "footie pajamas" could also describe such a garment, it is a more colloquial term and may imply a specific style or design element rather than the general category that "sleeper" covers. A "sleep sack" refers to a different type of sleep clothing that is usually more like a bag and does not have leg coverage. "Sleeping gown" typically describes a loose-fitting garment with a more open design, often used for ease of movement or during diaper changes, but does not offer the foot coverage that a sleeper provides.

Thus, "sleeper" is the most accurate and widely accepted term for this type of one-piece suit.