Usually to collect blood sample from infant, blood should be COLLECTED from the FOOT, from the HEEL region.
Pre-warm the infant’s heel, not too much that it hurts the infant ( 35-40 degree C) for 3-5 minutes, it increases the blood flow and helps to detect blood capillaries easily
Puncture the site with a sterile lancet
Never USE the central portion of the foot or too wide of the heel
Puncture across the heel print lines
With a clean and dry cotton piece wipe away the first drop of blood, and collect the sample from the SECOND drop of blood
Again apply some sterile solution to the puncture site to stop bleeding.