Tests on animals have suggested that in high doses some chemicals found in hair dyes and cosmetics may cause birth defects.
To be on the safe side, wait till the second or third trimester, when most of the baby's major organs have finished developing, before dyeing your hair. Opt for foil highlights over single-process color and ask your stylist not to apply dye too close to the root, or use plant-based products like henna.
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