• Black redstart chicks hatch within several hours. Females feed the chicks more often than males, but males bring more food at one time.
• Within the first 10 days, the weight of black redstart chicks increases more than 10 times. At 11 days old, they develop a feather coat.

The typical lifespan of the black redstart ranges from 7 years and 8 months to 12 years and 9 months, although the maximum recorded lifespan is 10 years and 3 months, with a theoretical lifespan ranging from 7 to 10 years; the species reaches sexual maturity from 9 months and 1 week to 1 year and 3 months. Development begins with the “Embryo” stage, during which the embryo develops inside an egg, progressing to the “Nestling” stage, where the young are in the nest and receive food from their parents for a period of 1 to 2 weeks and 1 day. Following this is the “Rapid Growth Post-Fledging Juvenile” stage, lasting from 2 weeks and 2 days to 11 months, during which the young bird learns to fly and forage independently. The species then enters the "Adult" stage, capable of reproduction, which lasts from 1 to 9 years.