Millennial parents dream of a golden age gap between kids. It comes with a catch.

Millennial parents often face financial challenges when raising children, with keeping two kids in day care costing thousands annually. Waiting longer between pregnancies can alleviate some childcare expenses and spread out costs by having only one child requiring full-time care at a time. However, this preference for spacing must be balanced against the reality of declining fertility rates as millennials have kids later.