Christmas Comes But Once a Year (1936) featuring Professor Grampy (without Betty Boop). The cartoon begins in an orphanage, where the orphans are all asleep in the dormitory, waiting for Christmas morning.
The orphans are given broken toys for Christmas. They burst into tears over having no other Christmas presents.
which is seen by Professor Grampy. The thoughtful inventor comes up with an idea to replace the toys with better ones.
While the orphans are still crying in the dormitory, Grampy dresses up as Santa Claus and surprises the orphans by ringing the bell and shouting, "Merry Christmas, everybody!" The orphans instantly stop crying, brighten and excitedly rush out to play with their new toys.