Older dogs who are not sold do not get human contact at the critical point in their development so that they can bond with people. (AnimalAllianceNYC.org)
Parents often focus on what are known as developmental milestones, which represent abilities that most children tend to display by a certain point in development. (verywellmind.com)
This allows the doctor to monitor the baby during key points in its development. (clothorganicdiapers.com)