Hello.Hair loss post pregnancy is a normal phenomenon.Hair loss post any kind of physical or emotional stress is known as Telogen Effluvium.Greying of hair could be attributed to genetics or nutritional deficiency.On the other hand,other causes of hair loss Nutritional deficiency,Thyroid disorders,Dandruff etc need to be ruled out before starting any treatment. Please visit your Dermatologist at the earliest for proper treatment. Regards, Dr.Sanchit Talwar, MD (Skin & VD), Consultant Dermatologist, Dr Talwar's Skin, Laser and Cosmetic Clinic, CHANDIGARH.