Parenting skills are widely thought to be naturally present in parents; however, there is substantial evidence to the contrary. Those who come from a negative or vulnerable childhood environment frequently (often unintentionally) mimic their parents' behavior during interactions with their own children. Parents with inadequate understanding of developmental milestones may also demonstrate problematic parenting. Parenting practices are of particular importance during marital transitions like separation, divorce, and remarriage; if children fail to adequately adjust to these changes, they are at risk of negative outcomes (e.g. increased rule-breaking behavior, problems with peer relationships, and increased emotional difficulties).