Yes it's a little high amount of weight gain...u have already gained about 20kgs... And still there are about 3 more months to go...wherein you ll gain weight much faster than earlier... Pls look into ur diet plan... Reduce carbs and fats.. increase proteins..fibres..liquids.. and walk morning and evening..

Eat small meal.; Go for fresh fruit apple on break fast and take dinner before 8 . Take vegetables Daliya or khichdi in break fast go for walk daily and most imp drink lots of water

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