Britannica. “Infancy | Definition, Characteristics, Stages, & Facts | Britannica.” Encyclopædia Britannica, 2019, www.britannica.com/science/infancy. Accessed 12 Oct. 2025.

---. “Jean Piaget.” Encyclopædia Britannica, 12 Sept. 2018, www.britannica.com/biography/Jean-Piaget . Accessed 12 Oct. 2025.

CDC. “Positive Parenting Tips: Infants (0–1 Years).” Child Development, 15 May 2024, www.cdc.gov/child-development/positive-parenting-tips/infants.html. Accessed 12 Oct. 2025.

Cherry, Kendra. “Trust vs. Mistrust: Psychosocial Stage 1.” Verywell Mind, 12 July 2022, www.verywellmind.com/trust-versus-mistrust-2795741. Accessed 12 Oct. 2025.

Harvard University. “Erik Erikson.” Harvard.edu, 2019, psychology.fas.harvard.edu/people/erik-erikson. Accessed 12 Oct. 2025.

Lewis, Charlie, and Jeremy Carpendale. “Piaget’s Theory of Childhood Development: A Foundation for Current Understanding of Children.” Child & Family Blog, May 2023, childandfamilyblog.com/piaget-stages-cognitive-development/ gad_source=1&gad_campaignid=16711977028&gbraid=0AAAAAog9ZS78LNwbQA9ozxmVfBIE5crj7&gclid=Cj0KCQjwgKjHBhChARIsAPJR3xeP8Iuq3VLpARWdnentvJpggbahfziQpv4GwJpFCMDtORMOiV7n_tsaArqmEALw_wcB#sensorimotor-stage. Accessed 12 Oct. 2025.

Medlineplus. “Infant - Newborn Development: MedlinePlus Medical Encyclopedia.” Medlineplus.gov, 24 Jan. 2023, medlineplus.gov/ency/article/002004.htm. Accessed 12 Oct. 2025.