one of the good ol' wives tales is sweet = girl, savory = boy. but I think its just that...a wives tale...
This is my third girl and each time I've craved savoury - mainly salt - and had varying degrees of how much sweet I can stomach. I have had very different feelings each time though towards coffee (great first time, ok second and can't stand it this time), milk (hated it first and second, can't get enough this time), ice cream etc. I really do think its different each time, and definitely not an indication of gender.