Disclaimer: I own nothing but the plot. Please don't sue me I'm poor.
After Bilbo announced her pregnancy Erebor prepared for the new arrivals twice as efficiently than last time. The people expected more than one child and they made sure to they had plenty of supplies this time.
Bilbo's due date soon arrived and she went into labour. She gave birth to four healthy babies, three boys and one girl. The girl was named Garnet and the boys were named Frerin, Bolrund and Gilund.
Again the people of Erebor hailed the birth a miracle and none were happier than Thorin as he watched his family grow.
As the years rolled by the royal family grew until Thorin and Bilbo agreed to stop having any more children when Oin grew concerned about Bilbo's health. By this time Bilbo had given Birth to fourteen girls and twelve boys. The line of Durin was secure.
Thorin couldn't have been happier to have the family he had always dreamed of.
The company were always kept busy by mischievous little Dwobbits always getting into trouble. Fili and Kili learned what it was like for their mum and uncle when they were little. Needless to say they did regret some of their actions when they were younger, not all but some.
Happiness throughout Erebor was felt for years and years and if some male and female dwarves made special trips to the shire seeking out husbands and wives, well nobody said anything.
The End.