My sister's daughter had same problem but know she is using mamaearth nourishing hair oil and the result is good. U can try it.

Density depends on parents. Apply mama earth massage oil n shampoo it's very good and has given good rests it's available online

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Take care of her nutrition. My daughter had thin and scanty hair.i started trying to give her nutritious meal, and apply; MamaEarth's nourishing hair oil for babies. I am seeing a visible change in hair growth spurt and it's texture