My favorite is Mint Baby as well. Doodles does have some really cute stuff as well, but some of their staff aren't very friendly or helpful. Another one to try that has some nice Christmas stuff is Itsy Bitsy Boutique.
Little Patooties (on Westheimer/Kirby) and Little Lords & Ladies (near Bering's on Westheimer) are 2 others I can think of offhand, though I agree, I like MINT the best. I've gotten 2 of K's Christmas dresses there in past years!
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Re: Baby boutiques near the Galleria
My favorites are Mint Baby in Uptown Park and Doodles in Rice Village
I haven't been to Mint Baby (will try it out today though) but I love Doodles!