Babies usually develop quite runny bowel movements two or three days after birth. These loose watery stools in newborns are caused by the fact that when they are born, babies' intestinal lining lacks adequate amounts of the enzyme lactase to digest the sugar of breast or cow milk - lactose. Undigested lactose in the colon causes water to be retained in the stool, producing the characteristic watery consistency. After a few days, the levels of lactase rise in the small bowel, and this phenomenon gets better. Breast fed babies also get colostrum for the first few days, which has a laxative effect.
Newborns have hiccups quite often.
No one knows with absolute certainty why this is, but hiccups are caused by reflex stimulation of the vagus nerve to the diaphragm. We assume the frequency of hiccups in newborns is a feature of their neurologic immaturity. Hiccups are harmless, do not bother the baby in the least, and go away in a few weeks. This reinforces rocking or nursing to sleep, which leads to the predictable problems of poor napping and erratic daytime schedules, and night waking and crying at around 8 months - leading their mothers in desperation to my most excellent video. Umbilical cords separate in two to three weeks on average.