Divorce is difficult on everybody impacted by the decision. This includes both partners, as well as any children they have together. The good thing is this: divorce doesn't have to turn life upside down for the children who are involved.
Unfortunately, this often is the final result because one or both parents don't have their child's best interest in mind. When a couple is able to reach an out of court agreement, regarding custody, there is less stress on all parties. However, this is not always the ways things work out.