When the offspring are born, they are hairless and have a body mass of approximately . Incisors and claws are already formed, but the digits, eyes, and pinnae are closed and cannot be used. The rate at which the young develop differs depending on the distribution range. However, the differences are usually no longer than a day. In Tuva, the pinnae open on the first day of birth and are completely open after three days of development. However, in Mongolia, the same process occurs between two and four days of development. Fur first grows on the crown, back, and abdomen. The young usually have a full coat of fur after seven days of development. Offspring born in captivity have a shorter development time than those born in the wild. Specifically, the growth and development of the head and body, tail, hind feet, and pinnae can be up to a day sooner than those found in the wild. After 28 days of development in captivity, the young are already around half the mass of their parents.