Acne is a disorder of the hair follicles and sebaceous glands. With acne, the sebaceous glands are clogged, which leads to pimples and cysts.

A hearing problem may be suspected in a child who is not responding to sounds or who is not developing language skills appropriately.

Here are guidelines on speech and language development that may help you decide if your child is experiencing hearing problems.

Detailed information on airway obstruction and children, including choking, suffocation, and strangulation

What causes asthma? It may be partially inherited, but many other environmental, infectious, and chemical factors are involved.

Pollen, dust mites, mold, and animal dander are the most common causes of allergic rhinitis.

Detailed information on allergies in children, including information on allergic rhinitis and food allergies

Children's teeth begin developing in the fetus. Good nutrition from the mother during pregnancy is important in the development of the teeth.

Anorexia nervosa (or simply anorexia) is an eating disorder that causes people to obsess about their weight and food.

Detailed information on the use of antibiotics and children

ADHD is a behavior disorder marked by inattention, impulsivity, and, in some cases, hyperactivity.

Detailed information on bedwetting (enuresis) in children, including causes, diagnosis, and treatment of urinary incontinence

Your baby may not have been delivered by stork, but some infants are left with “stork bites” on the backs of their necks. These pink or red patches are just one type of birthmark or variation in skin color that are common in babies.

Detailed information on insect bites, including bee stings, flea bites, mite bites, chigger bites, spider bites, tick bites, and lyme disease

Detailed information on animal bites and stings

Detailed information on insect bites, including bee stings, flea bites, mite bites, chigger bites, spider bites, tick bites, and lyme disease

Detailed information on blisters, including cause, first-aid, and treatment

Detailed information on bottle-feeding, including information on the different types of baby formula

Detailed information on breastfeeding and starting to breastfeeding

Bulimia nervosa is defined as uncontrolled episodes of overeating (bingeing) usually followed by self-induced vomiting, misuse of laxatives, enemas, or medications in an attempt to control weight.

Detailed information on burns, burn types, classification of burns, and burn treatment

Detailed information on care of the mouth and teeth for children

Detailed information on chickenpox, including symptoms, diagnosis, treatment, complications, and immunity

Your little one will need several immunization shots to help protect her from several childhood diseases, some of which can be deadly. Knowing which shots she needs, when, and what to do in the event of a minor reaction is important.

Whether you decided to have your baby boy circumcised or not, it’s important to know how to care for his special needs. Find tips for caring for both circumcised and uncircumcised babies.

Though the name sounds like a disease, colic is really just a term for excessive crying in an infant. Unfortunately, nobody knows for sure what causes colic, but there are several theories and possible risk factors for the condition.

Detailed information on common childhood illnesses and concerns

You had conjunctivitis as a child, now your baby has symptoms of it. Your first step should be a call to your doctor, who will make a diagnosis and prescribe the appropriate treatment.

Common causes of constipation in children: a low-fiber diet, not enough fluids, lack of exercise, and emotional issues.

Croup is most common in children younger than 5, with the peak age around 2. Croup occurs most often in winter.

Detailed information on dental health for children

Detailed information on diaper dermatitis, including causes, symptoms, diagnosis, and treatment

Diarrhea is defined either as watery stool or increased frequency of stool—or both—when compared with a normal amount. It is a common problem that may last a few days and disappear on its own.

Detailed information on disciplining a child, including information on time-out, temper tantrum, lying, stealing, and television and children

Detailed information on ear, nose, and throat conditions in children

Detailed information on adolescents and eating disorders, including anorexia, bulimia, and obesity

Detailed information on eye conditions in children

Detailed information on ecchymosis or bruising of the eye

When your child has a fever, the body resets its thermostat at a higher temperature. This helps the body fight off invading microorganisms.

Fifth disease is caused by the human parvovirus. It is most prevalent in the winter and spring and is usually seen in school-aged children.

Detailed information on firearm safety and prevention

Detailed list of recommended items for a household first-aid kit

Detailed information on food allergy, including cause, symptoms, and treatment

Detailed information on bicycle, in-line skating, and skateboarding safety

A fracture is a partial or complete break in the bone. When a fracture occurs, it is classified as either open or closed.

Detailed information on gastroesophageal reflux disease (GERD), including causes, symptoms, diagnosis, and treatment

Detailed information on gastrointestinal conditions in children

Most children need to be given consistent, clear rules and expectations about behavior. Discipline needs to begin as soon as the child is mobile—pulling up and crawling.

Detailed information on genital and urinary conditions in children

Glossary of terms relating to pediatrics

The more common causes of head injury in children are falls, motor vehicle accidents—in which the child is either a passenger or a pedestrian—or a result of child abuse.

Many headaches in children may be caused by tight muscles and dilated blood vessels in the head. Other headaches may be caused by an actual problem, such as a tumor or malformation of the brain, although this is much less common.

Detailed information on healthy child lifestyles, including information on dental health, nutrition, vision, speech, hearing, sleep, toilet-training, and discipline

Encourage your teen to eat three balanced meals a day, with fruits or vegetables as snacks.

The normal amount of sleep varies depending on the age of your child. A 2-year-old needs 10 to 12 hours a night, plus naps during the day. By age 6, a child usually has dropped naps, but still needs 10 hours at night.

Children and teens are at greater risk for heat-related illnesses for several reasons. They adjust more slowly to changes in air temperature. They also produce more heat with activity and sweat less.

Detailed information on dental and oral health in children

Detailed information on common childhood illnesses and concerns

Detailed information on stye, including causes, symptoms, diagnosis, and treatment

Use this list as part of a thorough safety check of your home. It can help prevent accidents and injuries.

Detailed information on impetigo, including causes, symptoms, diagnosis, and treatment

Detailed information on infant problems of the teeth and mouth

Detailed information on infections in children

Detailed information on infectious mononucleosis, including symptoms, causes, diagnosis, treatment, and transmission

Influenza is a highly contagious infection of the upper respiratory system. It's one of the most severe illnesses of the winter season, affecting up to 20 percent of Americans each year.

Detailed information on hernia, including risks, symptoms, diagnosis, and treatment

Learning disorders are sometimes called learning disabilities. Most children with learning disorders have normal intelligence, but they have difficulty with reading, math, or another academic area.

Lying and stealing are common, but inappropriate, behaviors in school-aged children. Most of the time these behaviors will be outgrown.

Most physicians recommend taking a baby's temperature rectally, by placing a thermometer in the baby's anus. This method is accurate and gives a quick reading of the baby's internal temperature.

Detailed information on mental health disorders in children

Detailed information on motor vehicle safety and children

Detailed information on neurological disorders in children, including headaches, head injury and seizures/epilepsy

A night terror is a partial waking from sleep with behaviors such as screaming, kicking, panic, sleep walking, thrashing, or mumbling.

Nosebleeds are fairly common in children, especially in dry climates or during the winter months, when dry heat inside homes and buildings can cause drying, cracking, or crusting inside the nose.

Detailed nutrition information for mothers who are breastfeeding or bottle-feeding, and toddlers, preschool-aged children, school-aged children, and adolescents

List of online resources to find additional information on pediatrics

Orthodontics is the dental specialty that focuses on the development, prevention, and correction of irregularities of the teeth, bite, and jaws.

Detailed information on orthopedic disorders in children, including fractures, sports injuries, overuse injuries, sprains, strains, and heat-related illness

Swimmer's ear is caused by fungi or bacteria that are encouraged to grow because of water that remains trapped in the ear canal after swimming.

Detailed information on otitis media, including causes, symptoms, diagnosis, treatment, and prevention

Detailed information on overuse injuries in children, including jumper's knee, patellar tendonitis, little leaguers' elbow, little leaguers' shoulder, osteochondritis dissecans, Sever's disease, shin splints, Sinding-Larsen-Johansson disease, spondylolisthesis, and spondylolysis

Detailed information on pharyngitis and tonsillitis, including causes, symptoms, diagnosis, and treatment

Detailed information on poison ivy/poison oak, including symptoms, diagnosis, treatment, and prevention

Detailed information on poisoning, including poison on the skin, in the eye, and poisonous fumes and gas

Preschool children are still developing their eating habits and need encouragement to eat healthy meals and snacks.

Detailed information on respiratory conditions in children, including asthma, croup, the common cold, and the flu

Detailed information on roseola, including cause, symptoms, diagnosis, and treatment

Detailed information on safety and injury prevention for children, including information on household safety, first-aid kit, airway obstruction, poisoning, bicycle safety, in-line skating safety, skateboarding safety, scooter safety, toy safety, sports sa

Eating healthy after-school snacks is important at this age, as these snacks may contribute up to one-third of the total calorie intake for the day.

Cradle cap can occur on the scalp, diaper area, face, neck, and trunk. Symptoms include dry or greasy scales.

A seizure occurs when parts of the brain receive a burst of abnormal electrical signals that temporarily interrupts normal electrical brain function.

Detailed information on sinusitis, including causes, symptoms, diagnosis, and treatment

Detailed information on skin conditions in children, including acne, birthmarks, bites, stings, blisters, burns, contact dermatitis, cradle cap (seborrheic dermatitis), diaper rash, impetigo, lice, poison ivy, poison oak, sunburn, and warts

Detailed information on healthy sleep habits of children, including information on nightmares and night terrors

Detailed information on sports injuries in children, including overuse injuries, sprains, strains, and heat-related illnesses

Because they are still growing, children are more susceptible to sports injuries. Half of those injuries could be prevented with proper safety gear, safer playing environments, and established safety rules.

Strains, sprains, and bruises make up the majority of sports injuries. Treatment for a strain or sprain depends on the child's age and the extent of the injury.

Detailed information sunburn, including symptoms and treatment

A baby's first tooth usually appears between 5 and 7 months of age. Often, the two middle bottom teeth come through the gums first, followed by the middle four upper teeth.

Detailed information on television and children, including suggestions for helping set good television viewing habits

These fits of rage—the stomping, screaming, and falling on the floor—are a normal part of childhood development. Temper tantrums often occur only with a parent. They are a way for the child to communicate his or her feelings.

At this stage of growth, your baby will gain 1-1/2 to 2 pounds in weight and more than an inch in height each month.

Your child can now says da-da and ma-ma, and possibly two other words, as well. He or she can also make a simple gesture such as shaking the head.

Your child is a toddler now and very active! He or she can climb stairs while holding on and play with push and pull toys.

Speech at this age is becoming clearer. Your child has a vocabulary of 200 to 300 words and can tell his or her age and name.

Most 3-year-olds have lost the rounded tummy of a toddler. Your child can use a spoon well and can wash and dry his or her hands.

This age is very social, and babies begin moving in much more purposeful ways.

A baby of this age rolls over easily from front to back and back to front, and bounces when supported to stand.

Adolescence is a time for growth spurts and puberty changes. Sexual maturation may occur gradually or several signs may become visible at the same time.

In the first month of life, babies usually catch up and surpass their birthweight, then steadily continue to gain weight.

Children at this age begin to understand concepts and can compare abstract ideas.

Although friendships become more important at this age, children are still fond of their parents and like being part of a family.

You take your kids to the pediatrician for tummy aches and fevers, but a pediatrician does a lot more than care for sick children. This doc is responsible for your child’s physical, mental, and emotional well-being—in sickness and in health.

Thumb sucking is normal in infants and young children. It shouldn't cause any permanent problems if your child stops by age 5.

Detailed information on child discipline and time-out

Mealtime with a toddler can be challenging, because children at this age are striving for independence and control. It's best to provide structure and set limits.

Detailed information on toilet-training your child

Tooth decay first appears as white spots on the teeth. The cavity then turns a light brown color and progressively becomes darker.

Detailed information on common childhood illnesses and concerns

Detailed information on toy safety and injury prevention in children

The common cold is one of the most common illnesses, leading to more doctor visits and absences from school each year than any other illness.

Detailed information on urinary tract infections, including causes, symptom, diagnosis, treatment, and prevention

Detailed information on a child's vision milestones

Detailed information on a child's vision, hearing, and speech milestones

Detailed information on the most common types of warts, including foot warts, flat warts, genital warts, and filiform warts

Detailed information on well-care visits and children, including when well-care visits should be scheduled

Detailed information on growth and development of children