Crying isn't the goal of this sleep training method, but advocates say it's often an inevitable side effect as your baby adjusts to sleeping on his own. (babycenter.com)
However, please don't accept that lumps or breast changes are due to mastitis or an inevitable side effect of breastfeeding, even if you are told this by a health professional. (pinkymckay.com)
It is also possible that sleep problems encountered by humans may not necessarily be an inevitable side effect of aging and may even be reversible. (sciencedaily.com)