Which of the following is true about women who experience hyperemesis gravidarum?
1) Seventy percent of all pregnant women suffer from it at some point in pregnancy.
2) Such women have vomiting severe and persistent enough to cause weight loss, dehydration, and electrolyte imbalance.
3) They need intravenous (IV) fluid and nutrition for most of their pregnancy.
4) They often inspire similar, milder symptoms in their male partners and mothers.