Why are bellies so different?
Each pregnancy belly is as unique as the woman who is carrying and the child that grows in it. Even so the myth that the form of the belly can indicate the sex of the child persists, it is untrue. The truth is that it is more a physical pre-condition of the mom to be.
If a woman is rather small and petite the baby does not has much room to expand it self like in the case of a tall woman with longer vertebra. This is the reason why the belly appears earlier as she is carrying it all in the front.
In case of a small pelvis the baby has not sufficient room to lower itself all the way down. The belly stays higher and arches further out.
The posture of a woman also plays a roll: A hollow-back pushes the belly further out and appears to be bigger.
If you have trained abs and firm connective tissue your belly will most likely not arch out as much in an unfit woman.
Not only will the size of the child influence the sizes of the belly. Very important is also the amount of amniotic fluid. It can be as little as about 10 FL OZ. or a much as 50 FL OZ. and you can see if you carry a pound or two more around.
As more pregnancies a woman has as more round and less high will her belly be. Uterus, aps and the complete body tissues are heavily stretched due to the pregnancy. Up to a certain degree this will regulate itself but without specific muscle training you will feel it latest in a new pregnancy.