#morning_sickness  nausea early in the day; a characteristic symptom in the early months of pregnancy
  supertype:  sickness__nausea  the state that precedes vomiting
  part of:  pregnancy__gestation  the state of being pregnant; the period from conception to birth when a woman carries a developing fetus in her uterus

No statement uses or specializes morning_sickness; click here to add one.