Bears on Babies, Installmoo 4: Halloween
The skull is translucent, so the brain is visible.
Best. Halloween. Costume. Ever.
The Life and Times of an anarcho-syndicalist group of Bears, formerly of Manhattan, now living in Canadia.
The skull is translucent, so the brain is visible.
There is insufficient evidence to pin down a single (or multiple) cause, but the leading theories for proximate causes include:
- An increase in the circulating level of the hormone estrogen. Estrogen levels may increase by up to a hundredfold during pregnancy.
- Low blood sugar during pregnancy.
- An increase in progesterone relaxes the muscles in the uterus, which prevents early childbirth, but may also relax the stomach and intestines, leading to excess stomach acids.
- An increase in human chorionic gonadotropin.
- An increase in sensitivity to odors, which overstimulates normal nausea triggers.