Teen health
Learning Center
How do COVID-19 antibody tests differ from diagnostic tests?
Antibody testing shows whether you've had the COVID-19 virus in the past. It's not the same as testing to see whether you have the virus now.
Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
Hydronephrosis
Learn about this condition that occurs when urine doesn't drain properly from the upper urinary tract, leading to kidney swelling.
Hypoplastic left heart syndrome
Learn more about this rare congenital heart condition that results in underdevelopment of the left side of the heart.
Hypospadias
Hypospadias is a birth defect in which the opening of the urethra is located on the underside of the penis instead of the tip. Learn about treatment.
Induced lactation: Can I breastfeed my adopted baby?
With time and dedication, breastfeeding without pregnancy (induced lactation) might be possible.
Infant development: Birth to 3 months
Expect your baby to change dramatically in the first few months.
Infant formula: 7 steps to prepare it safely
Properly preparing and storing infant formula is essential for your baby's nutrition.
Infant growth: What's normal?
Infant growth rates depend on various factors. Consider what's typical during baby's first year.
Infant jaundice
Learn about this common condition in newborns, especially those born preterm. With close monitoring and light therapy, complications are rare.
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