What is Birth to Three? Blount County Birth to Three, 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 Facebook Follow Birth to Three on Facebook for the latest news and events. Donate to Birth to Three Tax-deductible donations may be sent to LTVEC Central Office, 1094 Mulberry St., Loudon, TN 37774. Checks can be made to LTVEC with the note on the memo line indicating Blount Birth to Three.