10 Toxic Ingredients Pregnant Women Should Never Use in Their Beauty Routines

Commonly found in: nail polish, synthetic fragrance, and hairspray.

Why you should avoid it: Phthalates can interfere with our bodies' normal hormone functions. Often they're hiding under the innocent-sounding "fragrance/parfum" written on your ingredient list, though. "Look for companies who fully disclose fragrance ingredients," Renfrew said. Anything with undisclosed fragrance can mask a combination of hundreds of different ingredients.

Products without phthalates to try instead:

• Obsessive Compulsive Cosmetics Nail Lacquer ($10)
• Beautycounter Volume & Shape Volumizing Mist ($28)
• Any product labeled "Fragrance Free"