Normal growth and development encompasses all of the changes that occur from the moment conception takes place until a child reaches adulthood. For most of pregnancy, an embryo or fetus is unable to survive outside the mother’s body. At birth, infants have many organ systems functioning, such as the cardiovascular, respiratory and digestive systems, but cannot survive on their own.

Throughout childhood, enormous physical, emotional, cognitive and behavioral changes occur as babies go from being dependent on their parents for all of their needs to becoming independent adolescents, capable of functioning alone and reproducing themselves.

A child’s growth and development can be divided into the following stages: prenatal, infancy, early childhood, middle childhood and adolescence.

To support healthy growth and development throughout childhood and in later years, proper nutrition, adequate rest and physical activity are essential.

However, among the most important things parents and other caring adults can do as children grow and develop is to provide them with plenty of attention and unconditional support at every stage of their development.

Normal growth and development encompasses all of the changes that occur from the moment conception takes place until a child passes through adolescence and reaches adulthood. Throughout this timeframe, vast physical, emotional, cognitive and behavioral changes occur as babies grow and gradually learn to process and interact with their environment.

Most children develop at similar stages, reaching similar milestones within a few months of each other. It is normal for healthy children to grow and develop at their own pace. However, parents should notify their child’s physician if a child displays signs of possible developmental delays while growing up. These can include, but are not limited to failure to thrive, not being able to walk by age 18 months or not being able to read by age eight.

To promote health and development from the start, pregnant women should receive prenatal care. Research suggests that women who see an obstetrician-gynecologist (a physician who specializes in the female reproductive system and childbirth) regularly during pregnancy have healthier babies, are less likely to deliver prematurely, and are less likely to have other serious problems related to pregnancy.

Following birth, all the stages of childhood development can be monitored when children receive regular checkups with a physician, preferably a pediatrician. Regular contact with a pediatrician can also help monitor a child’s development and note any problem areas. Children should have regular well-child visits, during which the pediatrician can ask the parents if the child has met certain milestones for each stage of development.

To support healthy growth and development throughout childhood proper nutrition, adequate rest and physical activity are essential. Play is another important component of childhood development. It can help spur a child’s emotional, cognitive and social/motor development. Through various play activities, children can learn basic concepts and ideas, communication and socialization techniques, and physical skills.

In addition, among the most important things parents and other caring adults can do as children grow and develop is to provide them with attention and unconditional support at every stage of their development.

Prenatal development encompasses the 40 weeks of pregnancy. After conception, a zygote forms that rapidly changes into a blastocyte, embryo and finally a fetus. Every week of a woman’s pregnancy, the developing infant undergoes great changes as the body forms and takes shape. During the first three months (trimester) of pregnancy, the most dramatic changes occur. A ball of cells divides into three different types of tissue, which eventually divide to form the different body parts and organ systems. By the end of the first trimester, the fetus has the general appearance of a baby, with head, arms, legs and functioning organ systems.

Many problems that eventually become birth defects begin with malformations in the first trimester. For example, neural tube defects occur when the spinal cord fails to close properly. It may cause spina bifida or other more severe birth defects. Some abnormalities that occur are so severe that the pregnancy cannot be sustained and a miscarriage occurs. Other birth defects are the results of genetic defects, such as Down syndrome or muscular dystrophy. The mother’s actions during pregnancy may also affect the fetus, especially if she smokes, drinks alcohol or uses recreational drugs. Some birth defects can be identified and repaired in infancy.

During the second and third trimesters of pregnancy, most development is related to growth, weight gain and the outer appearance of the fetus. Some problems during these later parts of pregnancy may result in premature birth. Babies born before full term may be healthy, but may also be at increased risk for problems such as respiratory trouble, cerebral palsy and developmental delays. Even premature infants born with no apparent problems will develop more slowly than their full-term counterparts. When gauging an infant’s milestones, parents should measure from the baby’s actual due date. For example, a child born one month prematurely should not be expected to meet six-month-old milestones until he or she is at least seven months old.

The milestones of development during pregnancy are well defined. A woman’s obstetrician can monitor her progress throughout her pregnancy and can usually tell when certain milestones of weight or growth are not being met. Various prenatal tests may identify and rule out certain genetic problems.

Infancy development covers the period from birth to 12 months of age. During this stage, a baby will experience rapid changes, including physical growth and brain development. For example, the baby begins to breathe at birth, developing the respiratory system. The cardiac system has functioned during prenatal development, but changes occur in the heart after birth so that blood is oxygenated and transported throughout the body. Other than regular growth, physical changes include the fusing of the bones in the baby’s skull and the eruption of teeth in the first year.

An infant’s brain also grows rapidly, as does the neural connections inside the brain. In the first year, infants develop greater acuity in their senses and begin to understand and use methods of communication like crying. From early on they recognize speech, especially their parents, and eventually can understand the meanings of some words, long before they can speak coherently. Babies can speak a few words by their first birthday. They also begin to recognize that things continue to exist even if they are out of sight.

Infants also learn about social connections in their first year. They respond to their parents and other caregivers and learn to prefer their presence. They learn to smile, play and interact with others. By about the age of eight months, infants may develop separation anxiety when they are separated from their parents or primary caregivers.

Early childhood development encompasses the period when children are from one to four years old. Huge changes also take place during this stage, as children change from tiny, dependent infants to children who can walk, talk and begin formal learning. Many of the changes associated with this stage involve movement (walking) and communication (talking). Most children learn to walk early in their second year of life. At such a time, greater vigilance is needed to care for them because they have the ability to reach more dangerous objects, but not the understanding to avoid them.

Communication also grows rapidly in early childhood. Children learn to speak in sentences and understand what is being said to them. The vocabulary grows to about 1,500 words by age four, and children learn some complexities of speech, such as the use of pronouns or the past tense. Likewise, they may use their newfound abilities to test their boundaries in the home. Toddlers learn to say “no” and may refuse to obey their parents or caregivers. Temper tantrums may begin during this period. As children grow toward school age, the likelihood of temper tantrums lessens.

Children also learn to control their bodies during this stage. Most children begin toilet training somewhere before or near their third birthdays. The range differs for each child, but girls can usually be toilet trained earlier than boys. Almost all children have complete bowel and bladder control by the time they reach school age, although some children may have bedwetting problems.

Developmental delays and other problems may become more obvious during early childhood. Learning disabilities may become noticeable if a child does not take an interest in learning and getting ready to read. Other developmental disorders such as Asperger’s syndrome and autism may also become evident if children have problems with communication, social interaction and behavior. Monitoring a child’s development can help parents identify problems early and begin treating them early.

Middle childhood is the developmental period when children are ages five to 10 years old. During these years, children are more independent and physically active than they were during early childhood development. Physical changes mostly relate to growth in height and weight. Loss of primary teeth and the growth of permanent teeth also occur in these years.

Formal education begins during these years and cognitive development continues with greater inputs from reading and learning. The fine motor skills improve in most children with a better ability to write. Learning problems that may not have been identified earlier may become more apparent in these middle childhood years. These include dyslexia and attention deficit hyperactivity disorder (ADHD).  

Adolescence is the last major developmental stage from childhood to adulthood. It ranges from age 11 to 21. It is generally a time of self-discovery in which young people aim to define their place in the world.

The first part of adolescence encompasses the physical changes associated with puberty, or sexual maturation. Children’s bodies begin to produce more hormones and physical changes occur. In both boys and girls, more hair grows on the body, including pubic hair, and for boys, hair on the face. For boys, hormonal changes also mean growth of the sexual organs, greater frequency of erections and the ability to ejaculate semen from the penis. For girls, breast tissue grows, the hips widen and the monthly blood loss of menstruation begins. After menstruation begins (menarche), a young woman is physically capable of becoming pregnant.

The hormonal changes in both sexes are accompanied by greater sexual interest in other people. Teenagers may begin sexual behavior during this time, which may expose them to the potential for unwanted pregnancies and sexually transmitted diseases. The physical maturity may not be matched by a similar emotional maturity to handle such changes.

Many psychosocial changes are associated with adolescence. Teenagers may feel like they are adults but are not being treated as adults by their parents. Mood swings and emotional outbursts are common. They frequently test parental boundaries with risk-taking behaviors or general insolence. Some teenage rebellion is a normal part of growth. However, behaviors with serious consequences such as use of recreational drugs or alcohol and sexual recklessness can be a cause for concern. The emotional changes may be more serious for some teens, with thoughts of suicide or the potential for depression. Social changes in adolescence include greater activity and influences of peer groups.

In later adolescence, most overt physical changes have been completed. Girls typically finish growing by about age 16 and boys by about age 18. Physical changes that occur after this time may be the same as in any adult, related to nutrition and exercise. Good foundations about a healthy diet and regular exercise help teens at this stage to maintain healthy bodies.

Preparing questions in advance can help parents have more meaningful discussions with their physicians regarding their child’s development. Parents may wish to ask the following questions regarding development basics:

1. What milestones should I watch for and at what ages?
   
   
2. How long should I wait after noticing a developmental delay before calling?
   
   
3. Will my second child develop at the same rate as my first?
   
   
4. I have twins. Should they reach milestones at the same time?
   
   
5. What kinds of medical exams will my child need during childhood?
   
   
6. Is my child eating enough and getting enough of the right nutrients, vitamins and minerals?
   
   
7. Is my child getting enough physical activity?
   
   
8. By what age should children learn to read?
   
   
9. At what age should I discuss topics like sex and the dangers of drugs with my child?
   
   
10. How can I get my child to confide in me more?
    
    
11. How can I help my child develop good self-esteem?