The chicks are born blind and naked, requiring constant warmth from the mother, and fledge after 18–21 days. Parents are highly active, feeding each chick over 100 caterpillars daily.Nesting and Breeding CycleNest Building: Occurs in March to April, often in small tree holes or nesting boxes (ideally 25-28mm hole).Egg Laying: Females lay one egg per day (usually 8–12, occasionally up to 16).Incubation: The female incubates the eggs for around two weeks, starting once the clutch is almost complete, often creating a "brood patch" by plucking her own feathers.Hatching and Care: Chicks hatch in May. They are fed caterpillars, and the mother sits on them to keep them warm during the first week.Fledging: Young birds leave the nest in early June (18-21 days old).Blue Tit Family LifeFeeding: Parents are incredibly busy, providing up to 1,000 caterpillars daily for a full nest.Fledging Day: Parents often encourage young to leave by calling from outside the nest. The fledglings might only survive for a few weeks before becoming fully independent.Nest Usage: They are known to use the same nesting box over multiple years, particularly if they are successful in raising young.Broods: Blue tits typically raise one brood per year, though sometimes two.