A parent's interaction with a child, plays a very significant role in its development. I think that for any parent's first child, they are somewhat clueless. Of course, there are some that will argue maternal instincts, or even younger siblings give you a taste of parenting, but nothing compares to the real deal. I think the effort, not solely but in big part, plays a crucial role in the development. In the effort that a first time parent puts into their child, the more attention, love and nurturing the child will receive, with that creating a healthy and secure attachment style.