Can you give me some tips for gaining weight quick in 3months?

ok I wanna gain some serious weight on my hips n thighs n i need soome im underweight i look like a frickin 15 yr old n 2 make it worse im short im 5ft exactly. plz dnt tell me bout gaining muscle n all tht eating healthy sure doesnt help me i dnt need any1 2 debate with me on tht i jus need some tips on wat 2 eat