The phrase "tongue tie" refers to a condition where the thin piece of skin underneath the tongue is shorter or tighter than normal, restricting the tongue's movement. Full definition
She has developed a specialty in helping families with tongue tied babies and also enjoys meeting the specialized needs of the adopting family. (nurturenormally.com)
In the first hours, though, I recognized the signs of tongue tie with my son. (naturalparentsnetwork.com)
If you can't breastfeed due to latch problems (flat nipples, tongue tied baby etc) you can always pump. (babycenter.com)