The necessity of changing a diaper at bedtime is contingent upon various factors, including the infant's age, the type and absorbent capacity of the diaper, as well as the baby's sleeping patterns. Below are several considerations:

Types of diapers: Certain diapers are engineered with enhanced absorbent capabilities suitable for nighttime use, thereby minimizing the need for overnight changes.

Infant's age: Newborns and young infants typically require more frequent diaper changes due to their smaller bladders and developing digestive systems, which result in increased urination and defecation.

Baby's sleeping patterns: If an infant tends to awaken frequently during the night, it may be prudent to assess whether a diaper change is necessary. Conversely, if the baby sleeps soundly through the night, a change may not be required.

Skin condition: In cases where an infant suffers from diaper rash or has sensitive skin, more frequent changes may be warranted to mitigate moisture exposure and friction.

Diaper saturation: Should a diaper become excessively wet—even if the baby remains asleep—it is advisable to perform a change in order to prevent potential skin issues.

Infant comfort: A wet diaper can lead to discomfort for your baby, potentially impacting their sleep quality.

In summary, if a diaper is saturated or if an infant awakens due to discomfort caused by it being wet, then changing it at bedtime becomes essential. However, if the diaper remains dry and does not disturb your baby's comfort during sleep, nighttime changes may not be necessary. Each child's circumstances vary; thus decisions should be tailored according to individual needs.