These links are designed to give you perspective on typical development for children unaffected by 2q23.1 deletion/duplication disorders.

http://www.allkids.org/body.cfm?id=654

Developmental Milestones of a Typically Developing Child – aged 3 months to 36 month

http://www.cdc.gov/ncbddd/actearly/milestones/

Developmental Milestones of a Typically Developing Child – aged 2 months to 5 years

http://www.ldonline.org/article/6047/

Early Identification of Normal and Atypical Development

http://www.mayoclinic.com/health/child-development/MY00136

Child Development Chart: Preschool Milestones