Regulated Exploration Children: 60% of children fall into this category. These children closely watch their parents interact with their newborn sibling, approach them positively and sometimes join the interaction. They show fewer behaviour problems in the months following the new birth and do not display problematic behaviours during the parent-infant interaction. These children are considered secure as they act how a child would be expected to act in a familiar home setting with their parents present as secure bases to explore the environment.