I am 31 years old with 9 months old baby..for the past 3 days i am having itching on my thighs and legs only durring night. subsides morning..causes?

My first thought: would be some kind of contact dermatitis....from a soap or skin product. Vascular eczema, stasis dermatitis or scabies bites are other possibilities. Apply calamine lotion and consider taking an antihistamine before bed. For dryness use a non-allergenic, sensitive skin moisturizing lotion and consider an OTC steroid cream. If symptoms persist, you will need to see a Dermatologist. Best wishes:)