I never had dandruff until I got pregnant with DS. Now I have to use Head & Shoulders dry scalp shampoo. I also try to only wash my hair every other day. If you want a more natural product try a shampoo with tea tree oil in it.
With each child my skin gets dryer and dryer, especially my scalp. I hate it, I swear one of these days I will just collapse into a pile of dust. Not sure why I haven't tried H&S yet...I probably should.
I've had a dry scalp since #1. With #2 it was terrible and I had to buy H&S Clinical strength. Thankfully that worked because I was ready to scalp myself.
Re: Dry scalp