Final answer:
The maximum recommended depth for heel punctures is 2.0 mm, which is safe for infants to obtain blood while avoiding bone damage and excessive pain.
Step-by-step explanation:
The maximum recommended depth for heel punctures is 2.0 mm. Heel punctures are commonly performed to obtain blood samples from infants for various screenings. Ensuring that the puncture is not too deep is important to avoid damaging bones or causing excessive pain. A depth of 2.0 mm is considered safe and effective for obtaining the necessary blood sample without causing harm to the infant.