Common Baby Concerns
Our concern guides cover over 2,500 common baby health questions with age-specific information, action tiers (normal, mention at next visit, call now), and source citations from the AAP, CDC, and WHO.
2705+ evidence-based guides for the questions parents search at 2am. Each tells you what's normal, what to watch, and when to call your doctor.
How Often Do Babies Get Sick? What's Normal
It is normal for babies and toddlers to get 6-8 upper respiratory infections (colds) per year, and children in daycare may have even more — up to 8-12 illnesses annually. According to the AAP, the average child will have experienced 80-100 viral infections by their 6th birthday. Babies in group childcare settings tend to get sick more frequently in their first 1-2 years (often called the "germ year") but research shows they have fewer infections in later childhood compared to children who were not in early group care, as their immune systems were exposed sooner. Each cold typically lasts 7-10 days, and with back-to-back infections, it can feel like your baby is sick continuously through the fall and winter months. This frequent illness, while exhausting for families, is a normal part of immune system development.
Hunter Syndrome (MPS II) in Babies
Hunter syndrome (mucopolysaccharidosis type II, MPS II) is an X-linked lysosomal storage disorder that primarily affects boys. It is caused by a deficiency of the enzyme iduronate-2-sulfatase, leading to accumulation of glycosaminoglycans in cells throughout the body. The severe form involves progressive neurological decline along with coarse facial features, joint stiffness, enlarged liver and spleen, and hearing loss. The attenuated form preserves normal intelligence. Enzyme replacement therapy with idursulfase is available, and MPS II has recently been added to the RUSP newborn screening panel.
Hurler Syndrome (MPS I) in Babies
Hurler syndrome is the most severe form of mucopolysaccharidosis type I (MPS I), a lysosomal storage disorder caused by deficiency of the enzyme alpha-L-iduronidase. Babies appear normal at birth, but symptoms progressively emerge during the first year of life, including coarse facial features, enlarged liver and spleen, skeletal abnormalities, corneal clouding, heart disease, and intellectual disability. MPS I is on the federal RUSP newborn screening panel. Hematopoietic stem cell transplant performed before age 2 offers the best outcomes, and enzyme replacement therapy with laronidase is also available.
My Baby Has a Swollen Scrotum
A hydrocele is a collection of fluid around the testicle that causes the scrotum to swell. It's common in newborn boys and usually harmless. Most hydroceles disappear on their own by age 1. Your pediatrician will examine your baby to distinguish it from an inguinal hernia, which requires surgery. If the hydrocele persists or is very large, surgery may be recommended.
Hyperemesis Gravidarum
Hyperemesis gravidarum (HG) is severe nausea and vomiting during pregnancy that goes far beyond normal morning sickness. It affects about 1-3% of pregnancies and can cause dehydration, weight loss, and electrolyte imbalances. HG is not your fault and is not caused by anything you did. With appropriate treatment including IV fluids, anti-nausea medications, and nutritional support, most women with HG have healthy babies.
Hyperemesis Gravidarum - Severe Morning Sickness
Hyperemesis gravidarum (HG) is a severe form of pregnancy nausea and vomiting that affects 0.3-3% of pregnancies. Unlike typical morning sickness, HG causes persistent vomiting, weight loss of 5% or more of pre-pregnancy weight, dehydration, and inability to keep food or fluids down. It is a serious medical condition that requires treatment, not something to "push through." Effective treatments include prescription antiemetics, IV fluids, nutritional support, and in severe cases, hospitalization. HG is not caused by anxiety or psychological weakness.
Congenital Hyperinsulinism - Persistent Low Blood Sugar in My Baby
Congenital hyperinsulinism (CHI) is the most common cause of persistent and severe low blood sugar (hypoglycemia) in newborns and infants. The pancreas produces too much insulin, causing blood sugar to drop dangerously low. Signs include jitteriness, seizures, poor feeding, lethargy, and episodes of limpness or unresponsiveness. CHI requires urgent diagnosis and treatment because prolonged low blood sugar can cause permanent brain damage. Treatment may include medications (diazoxide, octreotide) or surgery depending on the type.
When Hypoallergenic Formula is Needed
Hypoallergenic formulas are specially designed for babies who cannot tolerate standard cow's milk or soy-based formulas due to allergies. Extensively hydrolyzed formulas (like Nutramigen or Alimentum) break milk proteins into tiny pieces that are less likely to trigger allergic reactions. Amino acid-based formulas (like EleCare or Neocate) are used for babies who react even to hydrolyzed formulas. These formulas require a prescription or pediatrician recommendation.
Hypoplastic Left Heart Syndrome (HLHS)
Hypoplastic left heart syndrome (HLHS) is a critical congenital heart defect where the left side of the heart is severely underdeveloped and cannot effectively pump blood to the body. It is one of the most serious heart defects but can be managed with a series of three surgeries (Norwood, Glenn, and Fontan) or, in some cases, heart transplantation. HLHS is often detected prenatally on fetal echocardiogram or shortly after birth when the baby develops cyanosis, rapid breathing, and poor feeding. Babies with HLHS require immediate specialized care at a pediatric cardiac center.
My Baby Has Hypospadias
Hypospadias is a condition where the opening of the urethra is on the underside of the penis rather than at the tip. It occurs in about 1 in 200 boys and ranges from mild to more complex. Most cases are repaired surgically between 6-18 months of age with excellent outcomes. If your baby has hypospadias, do not circumcise - the foreskin may be needed for surgical repair.
My Baby Has Ichthyosis (Scaly Skin Disorder)
Ichthyosis is a group of skin disorders characterized by dry, thickened, scaly skin. Ichthyosis vulgaris is the most common and mildest form, causing dry, flaky skin that is often mistaken for eczema. Lamellar ichthyosis presents at birth as a "collodion baby" - the newborn is encased in a tight, shiny membrane that sheds over the first weeks of life. Harlequin ichthyosis is the most severe and rarest form, with thick, diamond-shaped plates of skin separated by deep cracks at birth. Treatment centers on maintaining skin moisture with emollients, removing excess scale with keratolytics, and in severe cases, using retinoids. With appropriate care, many children with ichthyosis lead full, active lives.
Ideal Bedtime by Age
Most babies and toddlers do best with a bedtime between 6:00 and 8:00 PM, depending on their age, nap schedule, and morning wake time. An appropriately early bedtime aligns with the natural rise in melatonin and the circadian rhythm, leading to easier settling, longer nighttime sleep stretches, and less night waking. A bedtime that is too late often leads to overtiredness, not better sleep.
Identity Loss After Having a Baby
The transition to parenthood involves a fundamental reorganization of your identity — a process researchers call "matrescence" (for mothers) or more broadly, the parental identity shift. Mourning the person you were before is not selfish; it is a natural and necessary part of integrating parenthood into your sense of self. You are not losing yourself — you are expanding, and that process can be painful.
IEP vs. IFSP: Understanding Your Child's Plan
An IFSP (Individualized Family Service Plan) and an IEP (Individualized Education Program) are both legal documents that outline the support services your child will receive, but they serve different age groups and have different focuses. The IFSP covers children from birth to age 3 under Part C of IDEA and is family-centered, while the IEP covers children ages 3 and older under Part B and is more child-focused within the educational setting. Understanding the differences helps you advocate effectively for your child during the transition.
Selective IgA Deficiency in Children
Selective IgA deficiency is the most common primary immunodeficiency, affecting about 1 in 300-700 people. IgA is the main antibody found in mucous membranes (respiratory tract, gut, saliva, tears) and is the first line of defense against infections at these surfaces. Many people with IgA deficiency are completely asymptomatic and never diagnosed. Others experience more frequent respiratory or gastrointestinal infections, increased allergies, or associated autoimmune conditions. There is no replacement therapy for IgA specifically, but most children with IgA deficiency do well with supportive care.
IgA Nephropathy (Berger's Disease) in Children
IgA nephropathy (Berger's disease) is the most common type of glomerulonephritis worldwide. It occurs when IgA antibodies deposit in the kidneys, causing inflammation. A hallmark feature in children is visible blood in the urine (hematuria) that appears during or shortly after an upper respiratory infection. Most children with IgA nephropathy do well long-term, though some may develop chronic kidney disease over years to decades.
How Long Is Too Long: Illness Duration Guide
Most common childhood illnesses have predictable timelines: colds last 7-10 days, stomach bugs 2-5 days, ear infections improve within 48-72 hours of treatment, and croup typically peaks on nights 2-3 then improves. An illness that worsens after initially improving, lasts significantly longer than expected, or is accompanied by new concerning symptoms is worth evaluating. The pattern of the illness matters more than the exact number of days.
How Your Baby's Immune System Develops
Babies are born with an immature immune system that develops and strengthens throughout childhood. They receive some protective antibodies from their mother during pregnancy and through breast milk, but these gradually fade over the first 6 to 12 months. Every cold and virus your baby catches is actually training their immune system, and by age 7-8, most children have a mature, robust immune defense.
My Baby Has an Imperforate Anus (Anorectal Malformation)
Imperforate anus (anorectal malformation) is a birth defect where the baby does not have a normal anal opening. The condition ranges from a simple membrane covering the anus to complex malformations where the rectum does not connect to the anus at all. It is detected on the newborn exam, often when the baby fails to pass meconium (first stool) within 24-48 hours. Low-type malformations can be repaired with a single surgery. High-type malformations typically require a staged approach, starting with a temporary colostomy. Imperforate anus can be part of the VACTERL association, so babies are evaluated for other anomalies.
My Baby Has Impetigo
Impetigo is a common bacterial skin infection in babies and young children, caused by staph or strep bacteria. It appears as red sores that quickly develop into honey-colored crusts, most often around the nose, mouth, and hands. While it looks unpleasant, impetigo is very treatable with antibiotic ointment or oral antibiotics and clears up within a week or two of starting treatment.
Infant Botulism: Risks Beyond Honey
While honey before age 1 is the best-known botulism risk, infant botulism can also be caused by exposure to soil, dust (especially from construction sites), and potentially corn syrup or other environmental sources of Clostridium botulinum spores. The first symptom is usually constipation, followed by progressive weakness, a weak cry, poor feeding, and a "floppy" appearance. Infant botulism is treatable but requires immediate medical attention.
Infant Feeding Habits and Childhood Obesity Prevention
Research shows that feeding practices in the first two years of life can influence long-term obesity risk. Responsive feeding, where caregivers recognize and respond to a baby's hunger and fullness cues rather than encouraging them to finish every bottle, is the most evidence-based approach to healthy weight development. Breastfeeding, appropriate timing of solid food introduction (around 6 months), and avoiding the use of food as a reward or comfort tool all support a healthy relationship with food from the start.
Infant Formula Safety and Contamination Concerns
Commercially manufactured infant formula in the United States is strictly regulated by the FDA and is a safe, nutritionally complete option for feeding babies. However, proper preparation, storage, and handling are essential to prevent bacterial contamination. Powdered formula is not sterile, and in rare cases can harbor bacteria such as Cronobacter sakazakii, which can cause serious infections in young infants. Following preparation guidelines, staying aware of recalls, and proper storage are the most important safety measures parents can take.
Disappearing Bifidobacterium in the Infant Gut Microbiome
Research has shown that Bifidobacterium longum subspecies infantis (B. infantis), historically the dominant gut bacterium in breastfed infants, has largely disappeared from babies in industrialized countries. Studies suggest that 9 out of 10 U.S. infants lack this critical species. B. infantis uniquely digests human milk oligosaccharides (HMOs), the third most abundant component of breast milk, and its absence may be linked to rising rates of allergies, autoimmune conditions, and colic. While B. infantis-specific probiotics are now available, the long-term clinical benefits are still being studied.
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