Ans: Sometimes, there can arise bacterial infections in the navel in newborn babies. This is because a navel is essentially a scarred remnant of the umbilical cord which is commonly found amongst placental mammals. Along with bacterial infections, there can also be yeast infections. Sometimes they might occur due to improper hygiene and improper cleanliness of the area that results in the accumulation of dead skin cells, sweat, etc. which in turn results in a stinking navel. This problem can occur in any of the placental mammals.