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Toddler

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A toddler is a child typically between the ages of 1 and 3 years. The term is derived from the word "toddle," which describes the unsteady walking common at this age.

The First Steps 1893
The First Steps 1893

This period is defined by massive cognitive, emotional, and social development. While experts use specific milestones to track progress, development exists on a continuum. This means there is a wide range of what is considered normal. Individual differences are common, and factors like illness or premature birth can slow a child's progress.

Physical development involves several distinct areas of movement and sensation. Gross motor skills refer to the control of large muscles used for walking, running, and climbing. Fine motor skills involve the small muscles needed to draw or manipulate objects. Vision allows a toddler to interpret what they see at different distances. Hearing and speech involve receiving information and using language to communicate. For example, a one-year-old might use a pincer grasp to pick up small items. By 18 months, they may scribble vigorously in an attempt to draw straight lines.

Language skills expand at a rapid pace during these years. Most toddlers say their first word around 12 months of age. Between 18 and 24 months, vocabulary growth can be intense, with some children learning 7 to 9 new words every day. At 21 months, toddlers often begin using two-word phrases, such as "mama give." Some children even engage in "crib talk," which is a monologue used to practice conversational skills while in bed. This verbal proficiency helps them effectively convey their specific wants and needs to caregivers.

Social and emotional development brings new complexities to a child's life. Around 18 months, children begin to recognize themselves as separate physical beings. This is often tested using the "rouge test," where a mark is placed on a child's face. If the child touches their own face while looking in a mirror, they have achieved self-recognition. This milestone brings new feelings like pride and embarrassment. However, this stage can also include temper tantrums. These often occur because toddlers have strong emotions but lack the tools to express them. They may also be reacting to hunger, fatigue, or a desire for independence.

Medical professionals monitor several vital parameters to ensure healthy growth. For a toddler, a normal systolic blood pressure ranges from 80 to 110 mmHg. The diastolic pressure typically falls between 50 and 80 mmHg. Their heart rate usually stays between 90 and 140 beats per minute. The respiratory rate, or breathing rate, is generally between 20 and 40 breaths per minute.

Simple plastic potty
Simple plastic potty

Physical growth is also measurable; for instance, a two-year-old might weigh between 11 and 13 kg and stand about 80 to 82 cm tall.

Research has explored the connection between early milestones and later intelligence. A 2007 study of 5,000 children in the United Kingdom found that learning to stand earlier was linked to higher intelligence quotients later in life. Specifically, every month gained in learning to stand was associated with a 0.5 point gain in IQ at age 8. Another 2018 study focused on language milestones. Children who could form sentences before 24 months had an average IQ of 107. In contrast, those who formed sentences after 24 months had an average IQ of 101. While these milestones are significant, they only explain about 6% of the variance in adult IQ.

Understanding the toddler years helps explain the transition to more complex human behaviors. The drive for autonomy and independence seen in toddlers often repeats during adolescence. Even tasks like toilet training require a combination of physiological and psychological readiness. A child must be able to control their muscles while also having the motivation to follow directions. By studying these early years, we see the foundational steps of how humans learn to navigate the physical and social world.

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File:The First Steps 1893.jpg
The First Steps 1893.jpg
File:Simple plastic potty.jpg
Simple plastic potty.jpg
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