Name	Info	Provider	Link
	subscription/membership/fee required	Elsevier Science	https://linkinghub.elsevier.com/retrieve/pii/S0022-3476(19)31088-1
Child Development	free resource	MedlinePlus Health Information	https://medlineplus.gov/childdevelopment.html
	subscription/membership/fee required	Ovid Technologies, Inc.	http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31668885.ui
	subscription/membership/fee required	ClinicalKey	https://www.clinicalkey.com/content/playBy/pii?v=S0022-3476(19)31088-1
Cited by Patents in	free resource	The Lens - Patent Citations	https://www.lens.org/lens/search/patent/list?q=citation_id:31668885
Toddler Development	free resource	MedlinePlus Consumer Health Information	https://medlineplus.gov/toddlerdevelopment.html