The over-sensitive tongue thrust is a HUGE red flag for TT (incl posterior). Since the tongue can't explore the baby's mouth inutero it takes much longer to desensitize the mouth. DS just started being able to put solids in his mouth without gaging/puking/crying- I'd say he's at least 6 months delayed (behind DD).
Buzzerbeater, how old is your DD2? Can you give her rice rusks or biter biscuits yet? I was told to give these as soon as possible to avoid DS having oral aversions, that the longer you wait to introduce 'hard' things the quicker the tonguethrust/gag reflex will go away.
She's almost 7 months. I had thought about giving her something like biscuits so she could work on it more often. I wasn't going to give her grains of any kind but at this point I think that's not important. I'm just hoping dd continues to do well on ebf- I've got some dom ordered as my supply takes a huge hit around AF. Did you ever have to supplement DS? I really really don't want to do that, and so far the ped hasn't mentioned her weight, she is a peanut.