viviparously

/vaɪˈvɪpərəsli/
adverb
  1. In a manner that involves giving birth to live young that have developed inside the parent's body, rather than laying eggs.
    • Some species of sharks give birth viviparously, unlike the majority of fish that lay eggs.
    • The biologist explained that these reptiles reproduce viviparously, a rare trait among cold-blooded animals.
    • Most mammals reproduce viviparously, carrying their young inside the womb until birth.