Dr. Sarah Mitchell is a sleep consultant and the founder of Helping Babies Sleep. A strong advocate of shared sleep training responsibility, Mitchell notes that couples need to be careful about their relationships and their own sleep schedules while getting a baby into a routine. Mitchell points out that this is specifically important because babies respond differently to moms and dads. “When you’re working on removing the sleep crutch and it’s the dad who comes in to do the checks, the baby will typically cry for a shorter period of time,” Mitchell says.