Newborn young of the red kangaroo weighed about 750 mg. They had well‐developed nostrils and a large tongue and the forelimbs and digits of the inanus were well developed but otherwise the external features were embryonic. Sexes of the young were recognized when they were 14 to 20 days old. The young were firmly attached to the teat during the early part of pouch life, but one young removed from the teat at 43 days was able to re‐attach and another was found free when 70 days old. Observations relating to the appearance of body pigment, vibrissae and hair were made. Young about 150 days old were observed protruding their heads from the mother's pouch; they emerged temporarily at about 200 days and permanently at about 240 days. Young out of the pouch continued to suckle from the elongated teat they had used while in the pouch. Growth curves for the developing pouch young are given.In a non‐lactating female the interval between one oostrus, as diagnosed from the vaginal smear, and the next oestrus, at which mating occurred, was 37 days. The intervals between mating with the occurrence of fertilization, and post‐partum mating were 33 to 35 days. The gestation period was between 32 and 34 days. Fertilization occurred at post‐partum oestrus but the resulting offspring was not born while the earlier young occupied the pouch.If the pouch young was prematurely removed birth of a further young, resulting from post‐partum fertilization, occurred between 31 days 2 hours and 31 days 14 hours after removal. If the young was reared until it left the pouch birth occurred 230 to 252 days after post‐partum mating and in the absence of intervening mating.Parturition was observed five times in three females. During the hours before birth occurred pregnant females repeatedly cleaned the pouch by licking inside it. They also licked around the urogenital opening and one female licked the ventral surface between urogenital opening and pouch. Females sat on the base of the tail with the tail passed forwards between the hind‐legs, the legs extended forwards and the back supported by the enclosure fence while giving birth. Newborn young took about three minutes to reach the pouch after birth and there was no evidence that they were actively assisted