Hair Growth Remedies

i have 9 months old baby girl and have been told by my friends that shaving her head once in every 15 days incereas the hair-density and after some years she will grow silky soft hairs. Is the heridity anything to do with the hair growth and it’s quality. I would like add that i have silky hair. and i want my child to have better hairs than i have. Please comment on this.

I lost the hair on the top of my hair due to radiation and I was wondering if there are any special treatments I can do to promote the hair growth.
Should I wash my hair more or less? Right now I have some dry scalp so I use an all natural itching/dandruff shampoo that has been helping. Also, I wash my head twice a week and use a soft bristle brush to remove the dead skin and stimulate blood flow to my scalp.
Any recommendations?