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The English language includes a variety of phrases for children between age of birth to 4 yearsold, such as infant, newborn baby, toddler and baby. The terms are commonly used interchangeably, and could refer to different things to various people. This article will take a look at the various terms, along with the is the age range that they are applicable to, and a summary of the development and growth you can expect to see during the same time.Babies newborns, infants and infants

While the words "baby," "newborn," and "infant" are frequently used in conjunction, the precise definition will depend on the source you use.


Newborn typically is a term used to describe a baby who was born from birth to around 2 months old.

Infants are children from birth until one year old.

Baby could be used to describe all children born between birth and age 4 which includes infants, newborns and toddlers.

The Merriam Webster dictionary says"a baby" refers to a person who has just been born and doesn't set an upper bound on the word. Merriam-Webster defines infants as an infant in the beginning of their life, but it doesn't provide any information about the age of the child and describes infants to be "an extremely young child." According to the World Health Organization (WHO) defines the term "newborn infant," also known as neonate, as being a child who is less than 28 days old.1

Growth and Development

From birth to one year old infants expand and develop at a phenomenal rate. They begin to smile and move around, sit up to wave, clap take objects in their hands and crawl around and some may begin speaking some words.

They are taught to connect with their caregivers and trust them and are often able to comprehend more than they're able to communicate. Babies love music, movement and games that are simple like peek-a-boo.

At the time they reach the end of this stage the majority of infants are standing and walking around with furniture, even if they're not walking entirely on their own. They've usually tripled their weight at birth and grew between 6 and 8 inches when they're one year old.

Areas of Concern

Babies grow at different rates and it's normal for them to hit milestones at different stages of development. However, if you're concerned about your baby's growth talk to your pediatric physician.

Your baby's doctor will assure you or recommend an expert if there's the need for further examination. Note if your child appears to be in comparison to other babies in those areas.

  1. Smiling
  2. Moving, pointing, waving and other gestures using their hands
  3. Crawling, rolling or sitting unaided
  4. Singing or other attempts to express a message vocally
  5. Responding and knowing their name


The name itself suggests that toddlers are defined by Merriam-Webster's dictionary to mean a young child still learning to walk, or who walks. This usually occurs around 1 year old.

Toddlers are children who range from one year old to 4 years old age, but other countries may have different definitions for these definitions. There is no definitive definition of the maximum age of toddlerhood. But, the majority of people consider the toddler's final age to be the time when a child becomes ready to enter preschool.

Encyclopedia Brittanica defines the term "toddler" as a child who is aged between 12-36 months (1 up to three years of age) and the Centers for Disease Control and Prevention (CDC).2

The CDC determines that children between the ages of 3 and five years old as preschoolers.3

Growth and Development

As infants enter their 2nd year, they grow more mobile and confident, exploring all the things they can reach. The majority of children walk at the age of 18 months. They're also learning how to talk and to mimic people who surround them, and to follow basic instructions.4

As they grow older As they get older, they are able to express their emotions more clearly and speak in sentences and phrases, and can assist in getting outfitted and prepared for work. They love basic games, tunes and rhymes, and are able to begin learning colors shapes, alphabet, and colors.

As little sponges, toddlers saturate everything. This means that they can remember things quite easily.5 They'll still require lots of sleep, and can have a nap in the course of the day. They sleeping between 10 and 12 hours each at night.

When a child is 3 years old at the age of three, toddlers have typically grown between 53 percentage and 57 percent of their adult height.

Areas of Concern

Also, it's completely typical for babies to grow at different rate. However, consult with your pediatric physician if your child isn't reaching developmental milestones like:

  1. Walking
  2. Holding objects that are light
  3. Sucking and chewing on food
  4. They add more words and phrases to their repertoire on a regular basis
  5. Displaying interest in you and the other friends.
  6. Utilizing 2-word words (by 2 years of age)

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