I was a healthy weight before i got pregnant. BMI was perfect. I didnt start showing and gaining weight until 25 weeks. But now 10 weeks later at 36weeks ive gained nearly 20kg (over 3 stone). I just cant stop eating. Is this normal weight gain or do i need to speak to someone? Midwife never weighs me at my appointments and never mentions weight gain. Is this bad for baby? Could i get diabetes from such a fast weight gain? .. People say the babys weight is based on genes.. but others say babys weight depends on how much is gained during pregnancy. Which is true? Confused!!