I know you've had plenty of reassurance already, but I just wanted to add that Finn really isn't saying much at 15 months, just daddy, mama and bubble/babble, which means either bubbles or apple, depending on whether he's in the bathroom or has just spotted an apple . He doesn't really babytalk, unlike my friend's dd who was born on the same day, who constantly chatters with all the correct intonation of a sentence. And she's been walking independently for over a month, and can even safely use a small slide properly. Whereas Finn's slow with that too and is only now starting to show an interest in using his walker and can't stand on his own yet either.
Connor was a late talker too, I know Jules and I both felt our boys were a bit 'behind' on this compared to others on our BB, and although his pronunciation still isn't great he has a good vocabulary and is very interested in words, spelling, etc. Connor was an early crawler though, and up on his feet well before Finn. So no.2 is neither physical nor verbal!
It's difficult not to compare, but at least being a second-timer you know that they all get there eventually (but that doesn't stop a little bit of envy sometimes )
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