Hi, my name is Jennifer, I will be 35 weeks tomorrow. I went to the doctor today and he told me that the baby and I both lost weight. He also stated that the baby is not gaining weight properly. I have gestational diabetes, which cause me not to eat like I should. I love sweets and mostly junk food, but since the doctor wants me to watch what I eat, I just don't really have an appetite. What causes the baby to lose weight? I am 31 years old, 5'2 and weight now 242. Before I got pregnant I had a pituitary tumor remove about 3 mos. earlier.