Want to avoid phthalates? Make your own perfume. Those pesky toxic chemicals have been linked to obesity, among other health problems. And because fragrance manufacturers don’t have to tell us what’s in their formulation there can be as many as 3,000 different chemicals in one bottle of perfume, many of which are phthalates. One way to make sure you know exactly what’s in your signature scent is to make your own perfume, as I started doing last year.  But after a few Mommy Greenest readers commented with worries about my vanilla-base perfume staining clothes and skin, I figured out a new recipe, a rose-scented number that’s perfect for spring. And it’s clear! Want…