Tongue-tie occurs when the thin piece of skin under the baby's tongue (the lingual frenulum) restricts the movement of the tongue.
In some cases the tongue is not free or mobile enough for the baby to attach properly to the breast.
Tongue-tie occurs in about 5% of people. It is three times more common in males than females and can run in families. Some babies with tongue-tie are able to attach to the breast and suck well.
However, many have breastfeeding problems, such as nipple damage, poor milk transfer and low weight gains in the baby, and recurrent blocked ducts or mastitis due to ineffective milk removal.
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A baby needs to be able to cup the breast with his tongue to be able to remove milk from the breast well. If the tongue is anchored to the floor of the mouth, the baby cannot do this as well.
The baby may not be able to open his mouth wide enough to take in a full mouthful of breast tissue.
Youtube / Bernadette Bos