I loose my weight day by day and feeling tired.

Take high fiber low fat diet. Ask me directly for customized diet plan for you. 

The ideal weight for a 3 month old baby should be between 5-6kgs.

You should eat everything in moderate quantities. Try to keep your hands off oily and sweet food items. You can go through our blog to get extensive details about the diets you can try. https://www.credihealth.com/blog/low-carb-indian-diet/