The NH-29 is designed for a natural birth and reproduction cycle; they can reproduce copies of themselves asexually. Pregnancy can be started spontaneously whenever the mother neko wishes. At some point early after the pregnancy begins, the mother's body will ask her to determine her daughter's physical features and personality dispositions. It is possible for to include an automated random, or manual selection of traits from another person (such as a partner). The gender defaults to female.
Pregnancy lasts for about three standard weeks and will not usually affect the mother noticeably (no visible bulging of the belly or physical symptoms). The actual birth is painless (even pleasurable) and requires no medical intervention. The offspring (called a youngling) is born as an eight-inch miniature Nekovalkyrja. Nekovalkyrja younglings are precocial and are able to defend themselves and speak Yamataian from the moment they're born. In about three months, the youngling will grow to full size. For our purposes, there are no child Nekovalkyrja. Nekovalkyrja are born at the mental and physical age of 18.