Heartsick Baby is Circus Baby's Valentines Day variant, added on February 4, 2021. She is Circus Baby's second skin, after Broiler Baby.

Heartsick Baby's hair, dress, skirt and shoes are recolored to a purple-pink color. She has black eyes and red pupils. Her cheek buttons are turned magenta and are reshaped to look like hearts, with more heart emblems on both her knees and shoes. The scooper on her belly now has a heart-shaped hole accompanying it. Heartsick Baby's design is akin to the famous