Prolactin

Prolactin cannot be played unless you control a Newborn.
{t}: Promote the growth of mammary alveoli in
the breasts.
{3}{g}, {t}: Create a white Milk token with "This creature's power and toughness are equal to the
number of Newborns you control."
After its release from the anterior pituitary gland, it regulates metabolism and the immune system, but its
main task is developing milk cells in the breasts.