In the post's comment section, fashion designer Amber Farr joked: "Can I just have your hair for one day please?"
Munn responded to Farr and explained that she's dealing with postpartum hair loss.
"Ummm it's falling out in clumps post partum. I'll let you have it once I can grow it back and give it to you in better condition," Munn wrote.
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Representatives for Munn did not immediately respond to Insider's request for comment.
According to the American Academy of Dermatology (AAD), it's not uncommon for new mothers to experience hair loss a few months after having a child because of falling estrogen levels. AAD noted that dermatologists refer to the condition as excessive hair shedding, and it's temporary.
Munn and Mulaney revealed they were expecting a child in September 2021. During an appearance on "Late Night with Seth Meyers" that month, Mulaney told Meyers that they were both "really happy."
"You guys saved me from drugs, and Olivia and this baby have helped save me from myself in this early journey out of recovery. And yeah, I don't have a joke for that. I'm really grateful to you," Mulaney said.
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