So you need to show a change in the needs of you, the child or your spouse that make the current current custody arrangement difficult or impossible. (ylaw.ca)
Given current custody arrangements, she lives mostly with her mother who has failed to address this issue, but at least the watch is helpful when my fiancee and I have her. (pottypatty.com)
In Illinois, child custody may not be modified until at least two years after the original custody order, unless the court believes that the current custody arrangement will endanger the child's physical, mental, moral, or emotional health. (thespruce.com)