Bing found the following results
What Age Is An Infant, Baby, Newborn, and Toddler? - Parents
Infant development: Birth to 3 months - Mayo Clinic
Infant - Wikipedia
Infants (0-1 years) | CDC
Infant development: Milestones from 4 to 6 months - Mayo Clinic
Feeding Guide for the First Year | Johns Hopkins Medicine
Infant development: Milestones from 10 to 12 months
Baby - HealthyChildren.org
WebMD Baby: Newborn and Baby Care, Feeding and Development
Infants & Toddlers (Ages 0-3) - Milestones & Schedules