Weight gain in pregnancy is related to all except :
Total weight gain in singleton pregnancy averages 11kg. It is distributed to 1 kg in first trimester and 5 kg each in second and third trimester. Total weight gain at term is distributed as reproductive weight gain 6 kg (fetus,placenta,liquor,uterus,breasts,accumulation of fat and protein) and net maternal weight gain of 6 kg ( increase in blood volume and extracellular fluid). Ideally weight gain in pregnancy depend on pre-pregnant BMI(20-26 is 11-16kg, >29 is 7kg, <19 is 18kg) Reference: Dutta Textbook of Obstetrics 7th edition page 50
Ethnicity
Smoking
Socioeconomic status
Preconceptional weight
General obstetrics