My son & I went through a VERY rough time with breastfeeding when he was born!!! He couldn't open his mouth wide enough to nurse, and I thought it was just because my nipples/areolas are overlarge (I'm a DD). So, I endured toe-curling pain while my nipples got more and more infected, and I didn't know any different until my sister came to visit when Ryan (my son) was 14 days old. She said she had NEVER seen nipples look like that (her daugher was 21 mo at the time and was breastfed), so I called my midwives who referred me to a lactaion consultant.
Almost immediately, my LC diagnosed tongue-tie, so I made an appointment with a specialist who told me that he was NOT tongue-tied and it was just something that would correct itself as he and his mouth got bigger. Well, nothing changed, except I had a heck of a nipple infection, wasn't able/allowed to nurse (doc's orders), had to pump and bottle-feed and it took close to 2 months to heal enough that I could then go back to nursing with a nipple shield.
Still nothing improved, and my LC still swore he was tongue-tied and gave me the name and number of her friend who participated in a Type 3 tongue-tie study with an LC out of NYC. I emailed her, and she gave me the LC's email. This LC was AMAZING!!!!! Just by looking at THREE pictures, she could tell he had the Type 3 tongue-tie and referred me to a pediatrician who clipped tongues.
I made an appointment, he got his tongue clipped at 4mo, and I cannot even begin to tell you the DIFFERENCE RIGHT AWAY!!!!!! She asked me to nurse right after, and it was like someone had flipped a switch!! He opened his mouth SO wide, and everything was GREAT! He's almost 2 now, and we still nurse at bedtime, and everything's still great! It was a simple procedure that bled a little, but they say doesn't hurt. I couldn't imagine that, but the pediatrician said that most babies protest being held down more than having their tongue clipped. The whole thing took less than 3 minutes from laying him down to picking him back up.
I would HIGHLY recommend it!!! I don't know if my son's speech would've truly been impacted, but just from a breastfeeding viewpoint, I would find a respected pediatrician in the area and get her tongue clipped. Good luck and know that whatever decision you make is the one you feel is right for your family at this time!!!!!