If your body odor changed after pregnancy, a new medication, or a shift in your cycle, you're not imagining it and you're not doing anything wrong. Hormones changed the sweat; the bacteria just responded to the new menu.
Hormonal shifts change what your apocrine glands secrete, so skin bacteria produce a different, sometimes stronger smell. It's physiology, not hygiene. A deodorant that works on the odor itself handles it regardless of the driver, and gentleness matters more now.
Why hormones change how you smell
Body odor comes from bacteria on your skin metabolizing the protein- and lipid-rich secretion from your apocrine glands, the ones concentrated in the underarm. Hormonal shifts (pregnancy and postpartum, perimenopause and menopause, your monthly cycle, certain medications) change the composition and volume of that secretion. Different input, different output: the bacteria produce a different, sometimes stronger, smell. It's a normal physiological response, not a hygiene failure.
What a deodorant can and can't do
A deodorant can't change your hormones, but it can handle the odor regardless of what's driving the sweat, by acting on the molecules themselves rather than on the smell after it reaches you. That's the useful part: you don't have to wait out a hormonal phase to feel like yourself.
Why the formula matters more right now
Skin is often more reactive during these phases, especially postpartum. That's the worst time to be putting baking soda or heavy fragrance on your underarms.
Related reading: deodorant for menopause & hot flashes. Or compare all four formulas on the comparison page.