Also from the article:
"Add in extras like private school, a nanny and a flat-screen TV set in a kid's bedroom, and that figure climbs to $1.6 million."
"In San Diego, Jacqueline Jones recently rang in her fifth year with a $1,000 mermaid-theme party. The fête, held at a community pool, included a piñata, pizza, cake, juice boxes, customized goodie bags for 20 and a former beauty queen who arrived dressed head to toe as Ariel, the Disney princess."
"...toddlers in $800 strollers to 10-year-olds with cellphones. But for many families, drawing the line between attentive parenting and extravagance is a tough call;..."
"School itself is just the beginning. It might mean paying $16,500 in annual property taxes in an area with top public schools like Millburn, N.J., ..." (Note: Millburn has a median house price of $1 million, and a median income of $150k/year.)
[edit, in response to your edit: the USDA comes up with $11-13k for two-parent families with income of $57-98k/year. That's about $230k/child over 18 years, for a group of families all of whom are richer than average.]