What is Birth-to-Three?Blount County Birth-to-Three is an early intervention agency serving children between the ages of birth to 3 who have special needs and their peers. Where is Birth-to-Three?Birth-to-Three is located at 422 Ellis Ave. in Maryville, TN. Follow us on FacebookFollow Birth to Three on Facebook for the latest news and events. Donate to Birth to ThreeTax-deductible donations may be sent to LTVEC Central Office, 1432 East Lee Hwy, Loudon, TN 37774. Checks can be made to LTVEC with the note on the memo line indicating Blount Birth to Three.