Why might parents "relax" in their expectations of later-born children?

These are the possible correct answers; Firstly, They have come to trust their parenting skills, secondly, they have fewer resources to "share" amongst multiple children and lastly, they see that the first-born child is developing in a healthy way.

Parents tend to relax in hopes of expecting later born children, since they have already saw their parenting skills in their first-born, wherein their parenting was tested, as they see their effect on parenting, it boosts their confidence that they can raise children properly.

It's considered to be association or connection

Currently, as of february 2016, an american traveling in france would be by the exchange rate. the weakness of the euro and the strength of the us dollar means that items in france cost less to an american than they otherwise would. of course, if this trend reverses and the us dollar weakens and the euro strengthens, such as was happening in early 2008, an american traveling in france would have an adverse experience because items would cost relatively more.