Like other stingrays, the bluntnose stingray is aplacental viviparous. with the embryos initially sustained by yolk. Later in development, finger-like extensions of the uterine epithelium called "trophonemata" surround the embryo and deliver protein and lipid-rich histotroph ("uterine milk") produced by the mother. Only the left ovary and uterus in adult females are functional. Mating occurs during a well-defined period from April to June, peaking in May, with the males presumably using their pointed teeth to grasp the females for copulation. However, embryonic development halts at the blastoderm stage, shortly after the formation of the zygote, and does not resume for approximately ten months. In the spring of the following year, the embryos rapidly mature over a period of 10–12 weeks. This period of embryonic diapause may reflect the greater availability of food in the spring.