You have to try and remain calm in the middle of the night when the baby won't stop crying.
And you absolutely must not take it out on your partner who is in the other room while you're trying not to freak out. You must not curse his name and have an abusive one way conversation in which you take out all of your anger and frustration on him. You must remember all of this OR you must remember to turn off the baby monitor first. Either way.