Happy Monthiversary is a song from My Little Pony season 2 episode 13 “Baby Cakes”. It is sung by Pinkie Pie and performed by Andrea Libman.
Happy Monthiversary Lyrics
Pinkie Pie:
Happy month-i-versary to you and you today!
I-can’t-believe-you’re-already-a-month-old.
Time-sure-flies-doesn’t-it-wow.
Seems-like-only yesterday-you-were-born.
But now you’re a month old today, hey!