Breech birth. A breech birth is when a baby is born bottom first instead of head first. Around 3–5% of pregnant women at term (37–40 weeks pregnant) have a breech baby. Most babies in the breech position are born by a caesarean section because it is seen as safer than being born vaginally.Click to see full answer. In this regard, why does a baby come out head first?When a baby is born headfirst, his head molds to the shape of the birth canal. That’s why many babies are born with slightly pointed heads. But when a baby is in breech position, his head doesn’t have a chance to slim down. If the head can’t be delivered quickly enough, the baby could suffocate.Furthermore, why does the newborn exit the female head first? This is, in part, because an infant who arrives feet- or butt-first can get his head stuck in the birth canal. The infant’s body does not stretch the birth canal wide enough for the head to pass through, and the base of the baby’s skull cannot compress or mold to the birth canal as it does during a headfirst passage. In this way, what is it called when a baby is born arm first? Limb presentation during childbirth means that the part of the baby’s body that emerges first is a limb – an arm or a leg. Babies with limb presentation cannot be delivered safely via vaginal delivery; they must be delivered quickly by emergency C-section (4).What birth defects can cause a breech baby?A baby who is breech may be very small or may have birth defects. Because the head is delivered last, breech babies are also susceptible to umbilical cord compression and asphyxiation. When the umbilical cord becomes compressed, there is diminished oxygen flow to the baby.