I just had a look on fragrantica.com, which I sometimes find useful, if only because of the "People who like this also like ...." section for each fragrance. In the case of Baby Grace, the only one of the "also like" perfumes I really know, apart from other Philosophy ones (which is a bit obvious), is Prada Candy Florale and I do like that a lot. Actually, there's also Nina Ricci l'Air du Temps which I didn't know was still available and I am not sure I like that much.
Just as a comparison, this is how Fragrantica describe the three Graces. These 'complicated' descriptions don't always mean a lot to me though.
Baby Grace: "a Floral fragrance for women. The fragrance features mimosa and white musk."
Amazing Grace: "a Floral fragrance for women. Top notes are mandarin orange, grapefruit and bergamot; middle notes are freesia, jasmine and rose; base note is musk."
Pure Grace: "a Floral Green fragrance for women. The fragrance features lavender, musk, jasmine, water lily and bergamot."