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CDC. (2025a, 2. september). Milestones by 2 Years. Learn the Signs. Act Early.
https://www.cdc.gov/act-early/milestones/2-years.html

CDC. (2025b, 4. september). CDC’s Developmental Milestones. Learn the Signs. Act Early.
https://www.cdc.gov/act-early/milestones/index.html

Developmental Milestones: 2 Year Olds. (2009, 1. júní). HealthyChildren.Org.
https://www.healthychildren.org/English/ages-stages/toddler/Pages/Developmental-Milestones-2-Year-Olds.aspx

Normal growth and development: MedlinePlus Medical Encyclopedia. (e.d.). Sótt 10. desember 2025, af
https://medlineplus.gov/ency/article/002456.htm

Þroskaferlið. (e.d.). Heilsuvera. Sótt 10. desember 2025, af
https://www.heilsuvera.is/efnisflokkar/throskaferlid/