My hair & nails have actually gotten longer & stronger since I've been pregnant! I love it! The only thing I've noticed is that my hair is more greasy than its ever been! I don't have greasy hair & since I've been pregnant, it's way greasy even after I wash it!
There is nothing in prenatal vitamins that encourage hair growth. That's a myth. This is a hormonal thing that differs from woman to woman in pregnancy. Just like some people are sicker than others.
This is another thing that differs for everyone. Some women (like myself)- hair and nails grow stronger and longer and for others its the complete opposite. Taking vitamins may help
I've been having the same problem. It seemed to get better once I started taking my prenatals. :)
Prenatals can often boost hair and nail growth. However it is common to have hair loss while pregnant. Pregnacy it's self doesn't really boost hair and nail growth.