Sleep regression

Typically, regressions coincide with mental leaps, which are periods of accelerated cognitive development.

Suddenly, your baby's world changes, and their brain advances to the next level, leading to feelings of insecurity. Fussiness, restlessness, refusal to cooperate, and sudden sleep issues are all symptoms of the cognitive leaps your baby is experiencing. These regressions are normal and, most importantly, temporary. Sleep can also be disrupted due to teething, mental or growth spurts, changes in daytime nap schedules, or illnesses.