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The optimal depth for a capillary puncture in infants is indeed less than 2.0 mm to avoid bone injury. This recommendation is grounded in anatomical considerations; infants have very small and underdeveloped tissues and bones. Performing a capillary stick too deeply may risk piercing the underlying bone, which can lead to complications, including pain, bleeding, and potential infection.

By ensuring the puncture depth is less than 2.0 mm, healthcare providers can effectively collect a sufficient blood sample while minimizing the risk to the infant's delicate structures. This practice is crucial for ensuring both the safety and comfort of the infant during the blood collection process, aligning with established clinical guidelines for phlebotomy in pediatric care.

Other options propose depths that either do not adequately protect the infant from potential harm or suggest impractical puncture depths that could result in inadequate blood samples.