I am very skinny. I was born this way. I have a very fast metabolism. I eat like a cow as my wife describes yet I never get to gain but few pounds over the years. I guess I am lucky when it comes to that area.
Some women gains a lot of weight after they gave birth and I can understand that. Their body went to a lot of changes during pregnancy thus gaining weight is really very common.
I told my wife that even though she gained weight she still look very sexy. I encourage her to shop for clothes and be confident of her body. There are a lot of bigger women, bigger than my wife and they are happy with it. I guess it is an advantage that there are now places to shop for plus size clothes. It is now easy to shope for plus size party dress when you need one.