Mister Rogers' Neighborhood (1968)

S03E35 Episode 35

Dr. Bill Platypus and Digger Digorum manage to persuade King Friday that he will welcome the very first human baby in the Neighborhood of Make-Believe. After some reflection, King Friday agrees to let the Platypus family remain in the neighborhood. As a result, they will be the proud parents of the first animal baby born in that magical place.