Skin puncture on a newborn should preferably be performed on the:

a. Palmer side of the thumb
b. Palmer side of the index finger
c. Bottom side of the big toe
d. Lateral or medial surface of the bottom of the heel

ANS: D
The lateral or medial surface of the bottom of the heel should be used for capillary puncture on a newborn. Puncturing all the other sites poses a significant risk of hitting bone, resulting in serious injury and perhaps infection in the bone.