^^^^^ Maltby and Shire are highly respected by ME! Haven't I made that clear?
But I just spent four weeks with BABY and the problems with that material become clearer the more you watch it. Yes, the score is catchy, but it would work better in a revue about parenthood. Too often, characters are either given songs that don't fit the plot but are nice meditations on some aspect of conception OR characters stop singing almost entirely because they are childless and no longer participate musically in the theme of the show.
Put more bluntly, if you have three central couples and only one of them manages to bring a baby to term, then, mathematically speaking, you ought to call your show NO BABY! (Yes, I am being partially flippant, and, yes, I know they had collaborators on both BABY and BIG.)
That said, I've worn out and replaced CDs of CLOSER THAN EVER and STARTING HERE... (I have NYC and London versions of the latter.) I'm sure I'll continue to play BIG and BABY as well, while I wait for a "greatest hits of" revue.