6 week old baby temp of 97.3 taken with an artery thermometer... Is this too low?

Temp in infants. At 6 weeks of age many of the devices used to take body temperatures are not that accurate. I would say that it is not to low but if your baby feel cold and feet look blue, use a rectal thermometer to get an accurate temp. Typically when young infants are cold their hands and feet will feel cold, just as when they are too warm their head will sweat, assuming they do not have a fever.