Whether you divorce your child's other parent and share custody, or were never married and are raising your child separately, it is often difficult to get accustomed to custody arrangements. The first several months are often frustrating for all parties, even if both parents want to work together to provide a good life for their child.
Raising a child is difficult enough, but not knowing if that child is yours is a serious concern to bare. Eventually, you may decide that you need a DNA test, even though you love your child. At that point, you'll either be proved to be the biological father or be told you aren't related to the child.