Children born via cesarean delivery miss out on exposure to important microbes present in the mother that help to establish the baby’s gastrointestinal microbiota. As a result, these babies exhibited a less diverse species in microbiota colonization, which is associated with an increased risk of being overweight or obese. Just how great is the risk? A recent study found children who take the express lane are 64% more likely to become obese when compared to a sibling who takes the business route. This isn’t the only known drawback to bypassing the birth canal—underdeveloped immune systems as well as an increased risk of allergies, asthma, celiac disease and type one diabetes are all tied to cesarean deliveries. Time to re-think Lamaze.