The nurse is helping a mother breast-feed her newborn. Which activity by the infant is the best indicator that effective attachment to the breast has occurred?

The mouth covers the nipple and most of the areolar surface.

Loud sucking sounds are heard during the 15 minutes spent at each breast.

Vigorous sucking occurs for the first 5 minutes, then the infant relaxes.

The infant’s tongue is securely on the top of the nipple.