Myth
Many Indian myths state that if the buttocks are growing then the mom is carrying a girl and if the abdomen is growing then the mom is carrying a boy. However this is only a myth.
Fact:
One of the most normal body changes that a pregnant woman experiences in her 2nd trimester is that of the size of her buttocks increasing. The mom’s buttock size increases as the pelvis stretches to accommodate the growing baby and uterus and is a very natural phenomena because she is pregnant and has nothing to do with the gender of the baby. The shape of the stomach purely depends on how the baby is lying in the womb and again has got nothing to do with the gender of the baby.