Download to track developmental milestones from 2 months through 5 years. Provides information for parents of infants and toddlers. The term infant usually refers to a baby from birth to around 1 year of age. You may also use the term “baby” during this time or “newborn” for little ones up to around 3 months of age. In common terminology, a baby is the very young offspring of adult human beings, while infant (from Latin īnfāns 'baby, child', literally 'unspeaking') [1] is a formal or specialised synonym. The terms may also be used to refer to juveniles of other organisms. The meaning of INFANT is a child in the first period of life. How to use infant in a sentence. Infant development: Birth to 3 months Infant development begins at birth. Consider major infant development milestones from birth to 3 months — and know what to do when something's not right. As a parent you give your children a good start in life—you nurture, protect, and guide them. Learn about developmental milestones, including emotional and social development, for babies from birth to 1 year of age. There are many things you can do to help your baby stay safe and healthy. Merriam-Webster defines an infant as a child in the first period of life but doesn't give any age specifics. It describes a baby as an extremely young child. Separated from his mother when he was just an infant, the boy grew up in a children's home. She isn't able to look after herself at all - she's as helpless as an infant. Free baby growth percentile calculators using WHO, CDC, Chinese, Down syndrome, and Olsen preterm standards. Track weight, length, height, and head circumference. An infant is a very young offspring or child, typically under the age of one or two. This term is typically used in reference to humans, but can also be used for some animals.