At the earliest stage of life and specially before the children learn or try to walk, they are defined as Infant, whereas, a children who is trying to walk and just before the age of a year, can be termed as a toddler.

Infant is often referred to the first stage of life and toddler the second till the age of four years and before childhood, where the child comes out of his infancy and starts relating and behaving as per his/her surrounding.

Development of teeth occurs in the infant stage itself, the period of the same continues from the age of 4-5 months and till the child is a toddler, some teeth are still in the process of coming out.

Trying and learning to walk and toddle are some of the main physical developments that can be observed in a stage where the child is growing from an infant to a toddler. Some basic training and habits can be well imbibed in the child at the stage when the child has attained toddler hood.

Infants react to sign languages and often try to convey their messages and express themselves with the help of sign language while a toddler is at a stage where he sometimes tries to use the vowels and the consonants stringed together.