Tak seperti proyek penelitian lain, dengan menanyai perempuan yang telah melahirkan berapa banyak kopi yang mereka minum selama kehamilan, para ilmuwan Denmark memantau 1.207  pecandu kopi yang sedang hamil dan secara acak dipilih untuk meminum minuman berkafein atau tidak selama paruh kedua kehamilan mereka.
Unlike other research projects in which women who had given birth were asked how much coffee they drank while pregnant, the Danish scientists monitored 1,207 pregnant coffee lovers who were randomly selected to drink either a caffeinated or decaffeinated brew during the second half of the pregnancy.