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Basics About Your Newborn’s Body

For the past 9 months, you’ve been getting ready for your baby’s arrival. But now that you’re bringing home your bundle of joy, you may feel a little anxious. How will you ever remember everything you learned about what to expect in those first few weeks? Even the best-prepared parents may be surprised by a few things that are quite normal in newborns, according to the American Academy of Pediatrics (AAP). 


These common spots and stains may be present at birth and are usually harmless. Many eventually disappear on their own: 

  • Stork bite or nevus flammeus. This is seen on the forehead or on the back of the neck, or both. This mark almost always disappears as the child grows.

  • Congenital dermal melanocytosis or "Mongolian spot." This mark, which may look like a bruise, appears over the lower back and upper buttocks on darker pigmented babies. This spot frequently disappears by age 5 or 6.

  • Congenital nevus. This is also called a mole. Moles don't disappear and may grow larger over time.

  • Port wine stain. This is a red to purple mark that may appear anywhere on the body, but often on the face. This mark tends to grow larger over time.


It’s not uncommon to see a tiny bit of blood in your daughter’s diaper for the first couple of weeks. This tiny bit of vaginal bleeding is a response to the withdrawal of maternal hormones now that she’s not in the womb.  


Mom’s hormones that are still in your baby’s system may cause breast tissue to grow slightly, in both girls and boys. These lumps may last for a few months, but should then go away.  

Cord color

You’ve probably been told that your baby’s umbilical cord stump will fall off on its own. But, it will turn yellow and then brown or black first.

Odd movements

Newborns’ bodies are ruled by reflexes. So, your baby won’t be able to control most movements very well for the first few months. His or her chin, arms, or legs may seem shaky, especially when crying. 

Other skin conditions

Rashes and other skin conditions are common in newborns. Here's a look at several:

  • Acne. Newborn acne, or pimples that can break out on the baby's face, usually appears at 2 weeks to 3 weeks of age. The cause is unknown, but it seems to be associated with maternal hormones that pass from the placenta to the baby during pregnancy. The acne may worsen by 1 month but generally goes away without treatment. It may be helpful to gently wash the baby's face once a day with a mild soap to keep milk residue off the skin.

  • Cradle cap. Cradle cap looks like scaly white patches on the scalp. These patches are usually gone in a few months. In severe cases, the rash can spread onto the body, causing red bumps with a greasy appearance. Removing the flakes from the scalp with a soft brush during bath time can help prevent it from worsening. 

  • Erythema toxicum. This is a reddish-colored rash with small yellowish-white raised bumps in the center that may be seen on the face, trunk, legs, and arms. The rash may appear within the first couple of days after birth and last for about a week. The rash typically disappears without any treatment.

  • Milia. These tiny white bumps can appear on your baby's face. They will go away in a few weeks.

Rapid breathing

Healthy newborns average 40 breaths a minute. Adults take 12 breaths to 18 breaths a minute. An infant’s breathing may pause for up to 10 seconds. Then, the baby starts breathing again.   

Soft spots

The 2 soft areas on your baby’s head are known as fontanels. They’ll be there until the bones in the skull knit together. When your child cries, they may bulge. The soft spots may pulse along with their heartbeat.  

If you feel your child is ill or if something just doesn’t seem right, call your healthcare provider.

Reducing the risk for SIDS and sleep-related deaths

Here are recommendations from the AAP on how to reduce the risk for sudden infant death syndrome (SIDS) and sleep-related deaths from birth to age 1:

  • Get prenatal care. Routine prenatal care is critical for reducing the risk for SIDS.

  • Breastfeed your infant. The AAP recommends breast milk only for at least 6 months. And the group recommends that you keep breastfeeding for a year or longer if you can.

  • Make sure your baby is immunized. An infant who is fully immunized is at lower risk for SIDS.

  • Place your infant on his or her back for sleep or naps. Place your infant on his or her back for all sleep until he or she is 1-year-old. This can reduce the risk for SIDS, aspiration, and choking. Never place your baby on his or her side or stomach for sleep or naps. If your baby is awake, allow your child time on his or her tummy as long as you are supervising to help your child develop strong tummy and neck muscles. This will also help minimize flattening of the head that can happen when babies spend so much time on their backs.

  • Always talk with your baby's healthcare provider before raising the head of the crib if he or she has been diagnosed with gastroesophageal reflux (GERD or heartburn).

  • Offer your baby a pacifier for sleeping or naps, if he or she isn't breastfed. If breastfeeding, delay introducing a pacifier until breastfeeding has been firmly established.

  • Use a firm mattress (covered by a tightly fitted sheet) to prevent gaps between the mattress and the sides of a crib, a play yard, or a bassinet. This can reduce the risk for entrapment, suffocation, and SIDS.

  • Share your room instead of your bed with your baby. Putting your baby in bed with you raises the risk for strangulation, suffocation, entrapment, and SIDS. Bed sharing is not recommended for twins or other higher multiples. The AAP recommends that infants sleep in the same room as their parents, close to their parent's bed, but in a separate bed or crib appropriate for infants. This sleeping arrangement is recommended ideally for the baby's first year, but should at least be maintained for the first 6 months.

  • Avoid using infant seats, car seats, strollers, infant carriers, and infant swings for routine sleep and daily naps. These may lead to blocking of an infant's airway or suffocation.

  • Avoid placing infants on a couch or armchair for sleep. Sleeping on a couch or armchair puts the infant at much higher risk of death, including SIDS.

  • Avoid using illicit drugs and alcohol, and don't smoke during pregnancy or after birth. Keep your baby away from others who are smoking and areas where others smoke.

  • Avoid over bundling, overdressing, or covering an infant's face or head. This will prevent him or her from getting overheated, reducing the risks for SIDS.

  • Avoid using loose bedding or soft objects. Don't use bumper pads, pillows, comforters, blankets placed in an infant's crib or bassinet. This helps prevent suffocation, strangulation, entrapment, or SIDS.

  • Avoid using cardiorespiratory monitors and commercial devices. Don't use wedges, positioners, or special mattresses  to help decrease the risk for SIDS and sleep-related infant deaths. These devices have not been shown to prevent SIDS. In rare cases, they have resulted in the death of an infant. 

  • Always place cribs, bassinets, and play yards in hazard-free areas. To reduce the risk for strangulation, be sure there are no dangling cords, wires, or window coverings.