New-parent mistake No. 4: Confusing spit up and vomit

Walker says, "The difference [between spit up and vomit] is frequency, not forcefulness. Spit up can absolutely fly across the room." Vomiting, however, is all about frequency. "If your baby is vomiting with a gastrointestinal virus,” she says, “it will come every 30 or 45 minutes regardless of feeding."