system
Given the following post, respond as if you're commenting on Reddit:
human
Is your belly button still connected to anything after birth? If so, could you use it as a feeding tube?

If it is, what is it connected to? If it isn't, what happens after birth?
gpt
Hi there,
After birth the Umbilical cord starts to turn turn into a ligament and close of certain sections to become part of the circulatory system. The ligaments are Medial umbilical ligament, ligamentum venosum, and the round ligament of liver.

You could not use it as a feeding tube as there are only ligaments. The parts of the umbilical cord which became part of the circulatory system could not be used as a feeding tube as the feeding tubes go into the digestive tract[Stomach/Intestine]. 

The umbilical cord contains three sections: Umbilical vein, artery, and Allantois[which later becomes Urachus]. The vein carries oxygenated blood[unlike what veins are typically known for excluding the pulmonary veins] while the artery contains deoxygenated blood and waste. The Allantois is used to help with exchange gases and handle liquid waste.