21. Sleep training
Like it or not, you're going to have to get your baby to sleep on his or her own eventually. Some people get lucky and it happens easily. This hasn't been the case with either of my kids. Even if you try to work around crying it out, there comes a point where baby (or toddler... or preschooler!) has to be coaxed to sleep through the night. If I never have to sleep train another human being I'll be grateful.
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