The Williams family had solid numbers: housing, food, education, activities. They missed healthcare entirely in their ten-year forecast.

Their wake-up call came at ages 12 and 14 when both kids needed orthodontics. The cost: $11,400 over two years. Then their daughter developed anxiety requiring therapy: $3,600 annually. Their son tore his ACL: $4,200 in copays and deductibles.

Healthcare costs by child age from their actual spending:

• Ages 5-8: $1,200 annually per child (routine care, occasional illness)
• Ages 9-12: $2,800 annually (orthodontics, sports physicals, minor injuries)
• Ages 13-16: $3,900 annually (mental health support, sports injuries, dermatology)
• Ages 17-18: $2,400 annually (college prep physicals, final treatments)

They budgeted $1,500 annually total. They spent $3,400 average per child.

Better forecasting means including healthcare as a variable line item that increases with age. Consider your family health history. Factor in the likelihood of orthodontics, therapy, or sports injuries based on your kids' activities.

The families who handle this well maintain health savings accounts, research their insurance coverage limits annually, and build medical contingency funds separate from emergency savings.