Both handles a story about giving birth. In 14 sai no haha it's teenage girl giving birth and in Umareru it's +50 year old mother giving birth. Both dramas are really good.
Both discuss pregnancy and how life-altering a baby can be on not only the mother, but those around as well.
Both are family dramas about unplanned pregnancies and in both the mother has a special condition. In Daisuki the mother is mentally disabled and in Umareru the mother is over 51.