Question: how long should you let a 4 month old baby cry it out?
Answer: Let your baby cry for a full five minutes. Next, go back into the room, give your baby a gentle pat, an “I love you” and “good night”, and exit again. Repeat this process for as long as your child cries, making sure to extend the time you leave your baby alone by 5 more minutes each time until your baby falls asleep.