My maternal grandmother was born at home from natural childbirth in 1900 at only 6 months of age and weighing only 2 pounds. The doctor who came for the birth refused to make out a birth certificate because he insisted the newborn would not live. (Newborns lose between 7- 10% of their weight following birth when breastfed, so she had to weigh as little as 1.8 lbs. directly following birth).
My maternal great-grandmother kept her in a shoe box on a shelf, on the inside of an oven door, with the door propped open and the oven on, obviously on a lower, constant temperature which was continually checked. This set-up in the home served as what would later be known as an incubator used in hospital nurseries. My maternal grandmother was baptized in a church rectory the next day, which might have been hours following her birth (a common practice for newborn infants at great risk of death). My maternal grandmother lived, went to school (was very smart, wise, and intuitive, as well as pious), worked (hard), and had children, of whom my mother survived from birth, and raised a family. She was a homemaker, seamstress, wife, mother, and wonderful grandmother. And since her passing years ago, she has two great-grandchildren, my sons who are in their early thirties. My maternal grandmother had to go to court to have a birth certificate made for employment and social security purposes. They had to use her baptismal certificate and the testimony of multiple witnesses who were around near the time of her birth to be able to issue a birth certificate from the court. The court proceedings would have been a great testimony to the viability of a child at 6 months of age without extensive medical intervention, (only a mother's love and nurturing care). I came across someone else through the years that stated they had a relative born premature during that time period and heard they were also kept on a shelf on the inside of an oven door, to be kept warm. So I suspect some of the same strategy was used for premature births in 1876.