Potty training regression can occur at any time, even after a child has successfully been using the toilet for months. This setback can be frustrating for parents, but it's important to understand that regression is normal and can happen for a variety of reasons. Some common causes of potty training regression include changes in routine, stress, illness, or a sudden fear of the toilet. It's essential for parents to remain patient and offer encouragement to their child during this challenging time. Reintroducing positive reinforcement and creating a relaxed and supportive environment can help your child get back on track with their potty training.