29 month old slow with speech

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My 29 month old is very delayed in speech. I'm not sure exactly what he has. He

had speech therapy twice a month through Early intervention and the speech

pathologist noticed he was tongue tied. Now it's been over a month that his

tongue is free and he still has trouble talking. He has no trouble repeating

'bababa', 'gagaga', etc...the problem is he can't repeat actual words like

toddlers his age can. For example dog is gug, clock is ku, etc...I sort of feel

like the speech therapy is dragging on with no progress. I'm scared he might

have apraxia and will never talk. I don't know what else to do..