Fair enough.

What testing I have done thus far ingame seems to confirm as well, but I haven't been testing as extensively some of the folks here have, so take it with a grain of salt. I had a female subsist primarily on apples or watermelon for the duration of her four pregnancies, so it's a rather small data pool (some spaghetti was allowed for cravings). The three apple-based pregnancies resulted in boys. The watermelon-based pregnancy was accompanied by copious amounts of children's music and resulted in twin girls. Feel free to add that to the data pool if you want.

The Prima guide confirms the apples/watermelons theory. It also says that watching children's TV & listening to kids' music ups your chance of multiples.