Meconium Aspiration Syndrome (MAS)enparentshttps://kidshealth.org/EN/images/headers/P-meconiumAspiration-enHD-AR1.jpgMeconium aspiration can happen before, during, or after labor and delivery when a newborn inhales a mixture of meconium and amniotic fluid. Although it can be serious, most cases are not.meconium aspiration, meconium aspiration syndrome, meconium, delivery room, newborn, newborns, apnea, tachypnea, low heart rate, low apgar, limp, limpness, postmaturity, overdue, past due, past due date, breathing problems, hypoxia, surfactant, amniotic fluid, airways, neonatology, perinatology, nicu, icu, delivery, mas, labor and delivery, complications at birth, birth process, feces, newborn's health, amniotic fluid, small-for-gestational age, sga, cyanosis, apgar score, laryngoscope, acidosis, bpd, bronchopulmonary dysplasia, collapsed lung, pneumonia, lungs, lung disease, ecmo, rescue therapy, high-frequency oscillation, ventilator, amnioinfusion, saline, fetal distress, fetal monitoring, inhaling meconium, suction07/31/200001/02/202001/02/2020Jay S. Greenspan, MD01/01/2020ae4b1766-1f37-47f0-9627-d1ef7c5c4a7chttps://kidshealth.org/ws/RadyChildrens/en/parents/meconium.html/<h3>What Is Meconium?</h3> <p>Meconium is a newborn's first poop. This sticky, thick, dark green poop is made up of cells, protein, fats, and intestinal secretions, like bile. Babies typically pass meconium (mih-KOH-nee-em) in the first few hours and days after birth. But some babies pass meconium while still in the womb during <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/pregnancy-calendar-intro.html/">late pregnancy</a>.</p> <h3>What Is Meconium Aspiration Syndrome?</h3> <p>Meconium aspiration syndrome (MAS) happens when a <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/checkup-hospital.html/">newborn</a> has trouble breathing because meconium got into the <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/lungs.html/">lungs</a>.</p> <p>Meconium can make it harder to breathe because it can:</p> <ul> <li>clog the airways</li> <li>irritate the airways and injure lung tissue</li> <li>block surfactant, a fatty substance that helps open the lungs after birth</li> </ul> <p>With treatment, most babies with meconium aspiration syndrome get better with no problems.</p> <h3>What Causes Meconium Aspiration Syndrome?</h3> <p>Meconium aspiration happens when a baby is stressed and gasps while still in the womb, or soon after delivery when taking those first breaths of air. When gasping, a baby may inhale amniotic fluid and any meconium in it.</p> <p>Babies are more likely to pass meconium when:</p> <ul class="kh_longline_list"> <li>They've had a long or hard delivery.</li> <li>They are born past their due date.</li> <li>The mother has a health problem, like <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/gestational-diabetes.html/">diabetes</a> or <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/hypertension.html/">high blood pressure</a>.</li> <li>The mother <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/preg-smoking.html/">smoked</a> or used drugs during the pregnancy.</li> <li>They <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/iugr.html/">didn't grow well</a> before birth.</li> </ul> <p>Babies who are stressed by low oxygen levels or infections also may pass meconium before birth. When meconium gets in the amniotic fluid, there's a chance a baby will breathe (aspirate) it into the lungs before, during, or after birth. But most babies with meconium in the amniotic fluid will not get MAS.</p> <h3>What Are the Signs &amp; Symptoms of Meconium Aspiration Syndrome?</h3> <p>Before or at a baby's birth, doctors will notice one or more of these signs:</p> <ul class="kh_longline_list"> <li>The amniotic fluid is meconium-stained (green).</li> <li>The baby has meconium stains.</li> <li>The baby has breathing problems or a slow heart rate.</li> <li>The baby is limp.</li> </ul> <h3>How Is Meconium Aspiration Syndrome Diagnosed?</h3> <p>Doctors diagnose MAS in any baby with breathing problems who is born through meconium-stained fluid and has no other cause for the breathing problems. A <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/xray-exam-chest.html/">chest X-ray</a> can confirm the diagnosis. Doctors may do other tests to be sure nothing else causes the symptoms, such as a heart problem or <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/pneumonia.html/">pneumonia</a>.</p> <h3>How Is Meconium Aspiration Syndrome Treated?</h3> <p>Most babies with MAS get medical care in a special care nursery or <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/nicu-caring.html/">neonatal intensive care unit (NICU)</a> and get oxygen, if needed.</p> <p>A baby who gets extra oxygen but still struggles to breathe will get help from a breathing machine (ventilator). An infant with severe MAS may need more treatment, such as:</p> <ul> <li>surfactant to help open lungs</li> <li>inhaled nitric oxide. This gas is added to oxygen to open blood vessels and improve oxygen delivery.</li> <li><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/ecmo.html/">extracorporeal membrane oxygenation</a>. The ECMO machine, using a pump that works like the heart, pumps blood from the body through an artificial lung. Like a normal lung, it adds oxygen to the blood and removes carbon dioxide. Then the machine sends the blood back to the child.</li> </ul> <p>Most babies with MAS get better within a few days or weeks, depending on how much meconium they inhaled.</p> <h3>Can Meconium Aspiration Syndrome Be Prevented?</h3> <p>If a woman goes past her <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/due-date.html/">due date</a>, her doctor may recommend <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/inductions.html/">inducing labor</a> to help prevent MAS. If a pregnant woman's water breaks and she sees dark green stains or streaks in the fluid, she should tell her doctor right away. This is a sign that meconium is in the amniotic fluid.</p> <p>In the past, doctors sometimes did amnioinfusion (using saline to dilute meconium in the amniotic fluid) or suctioned meconium out of the baby's mouth and throat at birth. But these treatments weren't found to prevent MAS, so are not routinely done.</p> <h3>What Else Should I Know?</h3> <p>Most infants with meconium aspiration syndrome recover completely. Some babies may have a higher risk of lung infections and wheezing, particularly in their first year of life.</p>Aspiración de meconioEl síndrome de aspiración meconial puede ocurrir antes del parto o durante este, cuando el recién nacido aspira una mezcla de meconio y líquido amniótico (el líquido en que flota dentro del saco amniótico). Por meconio entendemos las primeras deposiciones que hace el bebé. Se trata de unas heces pegajosas, densas y de color verde oscuro que suelen expulsarse dentro del vientre materno al principio del embarazo y de nuevo durante los primeros días de vida extrauterina.https://kidshealth.org/ws/RadyChildrens/es/parents/meconium-esp.html/c003cd18-f45e-4b0b-be23-6c1ca9ba57de
A Week-by-Week Pregnancy CalendarOur week-by-week illustrated pregnancy calendar is a detailed guide to all the changes taking place in your baby - and in you!https://kidshealth.org/ws/RadyChildrens/en/parents/pregnancy-calendar-intro.html/f08368e4-e28d-4773-a168-306afac33137
Lungs and Respiratory SystemBy the time we're 70 years old, we will have taken at least 600 million breaths. All of this breathing couldn't happen without the respiratory system.https://kidshealth.org/ws/RadyChildrens/en/parents/lungs.html/6fe380c0-fe47-47a4-ba19-7e0944585a61
Newborn Screening TestsNewborn screening tests look for health conditions that aren't apparent at birth. Find out which tests are done.https://kidshealth.org/ws/RadyChildrens/en/parents/newborn-screening-tests.html/88c38a58-3915-44d8-aac8-2154433e4fab
Pregnancy & Newborn CenterAdvice and information for expectant and new parents.https://kidshealth.org/ws/RadyChildrens/en/parents/center/pregnancy-center.html/c58d014a-89a3-4c90-8b54-c9cadf5d6016
Transient Tachypnea of the Newborn (TTN)For some newborns, the first few breaths of life may be faster and more labored than normal because of a lung condition called transient tachypnea of the newborn (TTN).https://kidshealth.org/ws/RadyChildrens/en/parents/ttn.html/e3f8a17d-ebb2-48d0-9403-020cc7a941ef
When Your Baby’s in the NICULearn what a NICU visit will be like for your little one, what you can do to help, and how to find support for yourself.https://kidshealth.org/ws/RadyChildrens/en/parents/nicu-caring.html/62d6b167-886b-4e5a-a201-673cfb11383f
Your Baby’s Care Team in the NICUIf your baby is getting medical care in you NICU, find out who will be caring for your baby and how they can help. https://kidshealth.org/ws/RadyChildrens/en/parents/nicu-care-team.html/c6c3537f-31db-40f3-a8db-0a7095cff528
Your Child's Checkup: NewbornFind out what this doctor's checkup will involve after your baby arrives.https://kidshealth.org/ws/RadyChildrens/en/parents/checkup-hospital.html/668479bc-ffc7-4a76-89ed-e780611ba00f
Your Child's Development: NewbornDoctors use milestones to tell if a baby is developing as expected. Here are some things your baby may be doing this month.https://kidshealth.org/ws/RadyChildrens/en/parents/development-newborn.html/37d75e74-2af4-4be8-af9b-9f93f5dd44fb
Your Newborn's GrowthA newborn's growth and development is measured from the moment of birth. Find out if your baby's size is normal, and what to expect as your baby grows.https://kidshealth.org/ws/RadyChildrens/en/parents/grownewborn.html/e0ab9fc0-9148-43ec-b047-e05f68aa23a8
kh:age-allAgesOrAgeAgnostickh:clinicalDesignation-neonatologykh:genre-articlekh:primaryClinicalDesignation-neonatologyLungs & Respiratory Systemhttps://kidshealth.org/ws/RadyChildrens/en/parents/medical/lungs/804af3e6-468e-4721-b805-eb88e113b3c3Newborn Health Conditionshttps://kidshealth.org/ws/RadyChildrens/en/parents/pregnancy-center/newborn-health-conditions/85832563-037d-4bcf-b68e-8877d94e4fd5Health Problems of Preemieshttps://kidshealth.org/ws/RadyChildrens/en/parents/preventing-premature-birth/health-problems-of-preemies/9f1dabc6-56dd-4d0f-a7ae-c0083f79eeac