Babies will complete these stages at their own individual pace, and shouldn't be forced or rushed. (health-and-parenting.com)
Emerging potential for personalized and competency - based learning learning changes many of the policies and practices of managed curriculum / instruction (e.g., individual pacing rather than progressing in age cohorts). (crss.org)
Reading a text is something that each of us does at our own individual pace. (sciencedaily.com)