Mulaney posted the photo with its own soundtrack — the “F.U.N. Song” from “SpongeBob SquarePants” — and a text overlay that read “Uncle Pete!”
In the video, Davidson is admiring the baby and joking to someone off camera, “Yeah babies are all head.”
He shared a series of photos of him wearing the baby in a carrier on Wednesday, writing, “Happy Birthday to the tiny man who has been stuck to me for two months. Whoever you are sir, you sure are a fun companion.”
Munn has been sharing sweet snaps of Malcolm on Instagram over the past few weeks as well.
On Christmas Eve, she posted a photo of the newborn cuddled in a blanket and wearing a blue knitted hat.
“My Golden Ox baby. Malcolm Hiệp Mulaney. Happy Holidays,” she captioned the post.