Symptoms of Meconium Aspiration Syndrome
Before or at birth, the doctor will likely notice one or more symptoms of MAS, including:

meconium or dark green streaks or stains in the amniotic fluid

discoloration of the baby's skin - either blue (cyanosis) or green (from being stained by the meconium)

problems with breathing - including rapid breathing (tachypnea), labored (difficulty) breathing, or suspension of breathing (apnea)

low heart rate in the baby before birth

low Apgar score (given to newborns just after birth to quickly evaluate color, heartbeat, reflexes, muscle tone, and breathing)

limpness in the baby

postmaturity (signs that a baby is overdue, such as long nails)