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There are various reasons of hair greying and whitening as stress, prolonged illness, nutritional deficiency, hormonal imbalances etc.White hairs only turn grey after some time.
Some suggestions for you:
1. After washing the hair with cold water rub the scalp with fingers as it increases blood circulation and promotes hair growth.
2. Apply lavender oil 3 times a week during night on the scalp and wash off next day.It promotes hair regeneration.
3. Take mixture of lettuce and spinach juice about half a litre daily.
4. Take multivitamin tablet daily once for 3 months.
5. Have healthy nutritious diet comprising of proteins, Vitamin A, zinc, copper.
In the meantime also get some investigations done to rule out the cause of hair loss due to other reasons after delivery:
1. Iron studies.
2. Thyroid Analysis including complete hormonal profile.
3. Trichoscopy in which the hair and scalp structures are visualized.
Take Care!