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A pregnant woman passes antibodies to her unborn baby through the placenta to protect against certain diseases. How long does this natural immunity last?

Infants and ToddlersSee All
Young children often suck on their thumbs. It's perfectly normal. But some parents worry about it. ...more
With childhood obesity on the rise, should parents worry about the weight of their babies? ...more
 Diapers and Diaper Rash in Infants and Toddlers
A core part of every baby's care is diapering. Read on for helpful information on changing diapers, preventing and treating diaper rash, and the pros and cons of cloth and disposable diapers. ...more
 Gastrointestinal Problems in Infants and Toddlers
If your baby seems fussy and you've fed and changed him, he may have an upset stomach or colic. But don't worry, there are lots of things you can do to make your little one more comfortable and keep both of you calm. ...more
 Cradle Cap in Infants and Toddlers
Cradle cap (infant seborrheic dermatitis) is scaly patches on a baby's scalp. Cradle cap isn’t serious, but it can cause thick crusting and white or yellow scales. Some babies can also have seborrheic dermatitis in the diaper area, and on the face, neck, and trunk. Cradle cap usually clears up within the first year. ...more
 Constipation in Children in Infants and Toddlers
Constipation is when a child has very hard stools and has fewer bowel movements than normal. It is a very common gastrointestinal (GI) problem. ...more
 Diarrhea in Children in Infants and Toddlers
Diarrhea is a common problem. It may last 1 or 2 days and go away on its own. If diarrhea lasts more than 2 days, your child may have a more serious problem. Read on to learn more. ...more
 Separation Anxiety in Infants and Toddlers
Separation anxiety usually begins around 6 months of age. Babies may suddenly be afraid of familiar people, such as babysitters or grandparents. ...more
Young children often suck on their thumbs. It's perfectly normal. But some parents worry about it. ...more
With childhood obesity on the rise, should parents worry about the weight of their babies? ...more
 Diapers and Diaper Rash in Infants and Toddlers
A core part of every baby's care is diapering. Read on for helpful information on changing diapers, preventing and treating diaper rash, and the pros and cons of cloth and disposable diapers. ...more
 Gastrointestinal Problems in Infants and Toddlers
If your baby seems fussy and you've fed and changed him, he may have an upset stomach or colic. But don't worry, there are lots of things you can do to make your little one more comfortable and keep both of you calm. ...more
 Cradle Cap in Infants and Toddlers
Cradle cap (infant seborrheic dermatitis) is scaly patches on a baby's scalp. Cradle cap isn’t serious, but it can cause thick crusting and white or yellow scales. Some babies can also have seborrheic dermatitis in the diaper area, and on the face, neck, and trunk. Cradle cap usually clears up within the first year. ...more
 Constipation in Children in Infants and Toddlers
Constipation is when a child has very hard stools and has fewer bowel movements than normal. It is a very common gastrointestinal (GI) problem. ...more
 Diarrhea in Children in Infants and Toddlers
Diarrhea is a common problem. It may last 1 or 2 days and go away on its own. If diarrhea lasts more than 2 days, your child may have a more serious problem. Read on to learn more. ...more
 Separation Anxiety in Infants and Toddlers
Separation anxiety usually begins around 6 months of age. Babies may suddenly be afraid of familiar people, such as babysitters or grandparents. ...more
More
Pre-Schoolers and School-Age See All
As part of your preparation for your new baby, you probably got an infant safety seat for the car. But do you know how to make sure it’s installed correctly? And when do you switch to a child safety seat? Learn the ins and outs of safe car travel for your little one. ...more
 Biting in Pre-Schoolers and School-Age
Young children may bite others out of frustration or stress, or because they feel powerless. Infants and toddlers often bite as a way of exploring their world. ...more
 Tinea Infection in Pre-Schoolers and School-Age
Detailed information on the most common types of ringworm, including diagnosis and treatment ...more
Stuttering is a speech problem. The normal flow of speech is disrupted. A child who stutters repeats or prolongs sounds, syllables, or words. Stuttering is different from repeating words when learning to speak. Stuttering may make it difficult for a child to communicate with others. ...more
Autism spectrum disorder is a problem that affects a child's nervous system and growth and development. It often shows up during a child's first 3 years of life. ...more
A learning disorder is when a child has trouble learning in certain school subjects. Your child may have problems with reading, math, or writing. Here's what you need to know, and how to help. ...more
 School Refusal in Pre-Schoolers and School-Age
There are many reasons why a child would feel anxious and not want to go to school. Read on to learn more about school refusal. ...more
When wetting happens in a child who is old enough to control their bladder, it’s known as enuresis. Here's what you need to know. ...more
As part of your preparation for your new baby, you probably got an infant safety seat for the car. But do you know how to make sure it’s installed correctly? And when do you switch to a child safety seat? Learn the ins and outs of safe car travel for your little one. ...more
 Biting in Pre-Schoolers and School-Age
Young children may bite others out of frustration or stress, or because they feel powerless. Infants and toddlers often bite as a way of exploring their world. ...more
 Tinea Infection in Pre-Schoolers and School-Age
Detailed information on the most common types of ringworm, including diagnosis and treatment ...more
Stuttering is a speech problem. The normal flow of speech is disrupted. A child who stutters repeats or prolongs sounds, syllables, or words. Stuttering is different from repeating words when learning to speak. Stuttering may make it difficult for a child to communicate with others. ...more
Autism spectrum disorder is a problem that affects a child's nervous system and growth and development. It often shows up during a child's first 3 years of life. ...more
A learning disorder is when a child has trouble learning in certain school subjects. Your child may have problems with reading, math, or writing. Here's what you need to know, and how to help. ...more
 School Refusal in Pre-Schoolers and School-Age
There are many reasons why a child would feel anxious and not want to go to school. Read on to learn more about school refusal. ...more
When wetting happens in a child who is old enough to control their bladder, it’s known as enuresis. Here's what you need to know. ...more
More
Adolescents and TeensSee All
A closer look at the structure of the breast....more
Breast development happens in certain stages during a woman's life: first before birth, and again at puberty and later during the childbearing years. Changes also happen to the breasts during menstruation and when a woman reaches menopause. ...more
Teen dating violence is worrisome. But it's not inevitable. Here's how you and your teen can prevent possibly unsafe situations and reduce the risk for problems. ...more
The male reproductive anatomy includes the bladder, epididymis, penis, scrotum, and prostate gland. ...more
A detailed look at STIs and teens, from protection and treatment to different types of STIs. ...more
Women suffer more frequent and severe symptoms from STDs. Some STDs can cause pelvic inflammatory disease, which can lead to both infertility and ectopic pregnancy. ...more
 Bulimia Nervosa in Children in Eating Disorders
Bulimia nervosa is an eating disorder. A child with bulimia overeats or binges uncontrollably. This overeating may be followed by self-induced throwing up (purging). ...more
 Anorexia Nervosa in Children in Eating Disorders
Anorexia nervosa is an eating disorder. It is a form of self-starvation. Children and teens with this health problem have a distorted body image. They think they weigh too much. ...more
Female Sexual Development Male Sexual Development Sexually Transmitted DiseasesEating DisordersMood DisordersAlcohol and Tobacco Drugs
A closer look at the structure of the breast....more
Breast development happens in certain stages during a woman's life: first before birth, and again at puberty and later during the childbearing years. Changes also happen to the breasts during menstruation and when a woman reaches menopause. ...more
Teen dating violence is worrisome. But it's not inevitable. Here's how you and your teen can prevent possibly unsafe situations and reduce the risk for problems. ...more
The male reproductive anatomy includes the bladder, epididymis, penis, scrotum, and prostate gland. ...more
A detailed look at STIs and teens, from protection and treatment to different types of STIs. ...more
Women suffer more frequent and severe symptoms from STDs. Some STDs can cause pelvic inflammatory disease, which can lead to both infertility and ectopic pregnancy. ...more
 Bulimia Nervosa in Children in Eating Disorders
Bulimia nervosa is an eating disorder. A child with bulimia overeats or binges uncontrollably. This overeating may be followed by self-induced throwing up (purging). ...more
 Anorexia Nervosa in Children in Eating Disorders
Anorexia nervosa is an eating disorder. It is a form of self-starvation. Children and teens with this health problem have a distorted body image. They think they weigh too much. ...more
More