Cribsheet: A Data-Driven Guide to Better, More Relaxed Parenting, from Birth to Preschool (The ParentData Series)

by Emily Oster

so they’ll typically use a heel prick to get a drop or two. The test results are reported in a number (11.4, say, or 16.1); higher numbers are worse. Just as with weight loss, interpreting this test depends on the age of the