Latch (breastfeeding)

A good latch. The lower portion of the areola is well within the baby's mouth, which is opened wide. Lips are flanged out.
The process of achieving a good latch (1 minute 7 seconds)

Latch refers to how the baby fastens onto the breast while breastfeeding. A good latch promotes high milk flow and minimizes nipple discomfort for the mother, whereas poor latch results in poor milk transfer to the baby and can quickly lead to sore and cracked nipples. In a good latch, both the nipple and a large portion of the areola are in the baby's mouth.