Something in the Water

Almost everyone I know is pregnant. Not pregnant with emotion but actually pregnant. Can you even be pregnant with emotion? Probably not. This reminds me a poem I read once that was a metaphor about a pregnant lady. The imagery is rich although I'm not quite sure I get the green apples bit...

I've included it below. Congratulations to all my friends expecting bundles of joy!

I'm a riddle in nine syllables,
An elephant, a ponderous house,
A melon strolling on two tendrils.
O red fruit, ivory, fine timbers!
This loaf's big with its yeasty rising.
Money's new-minted in this fat purse.
I'm a means, a stage, a cow in calf.
I've eaten a bag of green apples,
Boarded the train there's no getting off.

-Sylvia Plath