Problem: Sometimes babies have a hard time latching on because of anatomical mouth problems, like a high arched palate, a tongue that is too large or has a limited range of motion, or abnormalities with the chin, jaw or palate. (whattoexpect.com)
I have been using nipple shields with my first son exclusively for the first 1 month because the first time he latched on directly after birth, my nipples got cracked to blood and it was just impossible to nurse without shields. (justbreastfeeding.com)
My daughter was a premie and had a hard time latching on until my lactation consultant gave me this lifesaver. (babycenter.com)