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The 30-year-old model and Lip Sync Battle host and the 37-year-old music artist welcomed their daughter, their first child, in April.
"John and Chrissy do want another baby sooner rather than later," a source told E! News exclusively. "They both always wanted a big family."
Teigen and Legend underwent years of infertility before welcoming Luna. The model underwent IVF treatments, consisting of dozens of hormone injections, to conceive their daughter. And they created siblings; the couple had some leftover embryos that were frozen for future use. They have not specified how many.
Unless the two conceive naturally, in order to become pregnant again, Teigen would need to undergo a similar but less rigorous medication to prepare her body and then have at least one of the embryos thawed and implanted.