Do your hips get wider after having a child?

Yes. During pregnancy hormones can make the joints of the pelvis more flexible and during birth this allows room for the baby to pass through the birth canal. There can be some residual changes to ones hips after having a baby, but is usually not a significant amount. Most of the "widening" is likely from extra weight put on during the pregnancy. Healthy diet, exercise, and breast feeding are the cure.