Fingerstick or heelstick?

We have a policy that we perform heel sticks on infants <1yr old unless the infant is walking.  This policy has always created a "grey" area on what do with children <1yr but walking.  We are using a 1.8mm depth lancet currently for finger sticks and I am concerned if staff use this on a finger of a walking 6-12mo old infant, there is a potential to hit a bone. Before I approach the lab medical director with recommendations for this grey area, I wanted to reach out to see if anyone else has a policy or practice they are using at their location that has been successful.  If so, would you be willing to share with me?